Even though she had a general knowledge of various spells, she was not trained for healing - even in the books she mentions she never attempted to further her knowledge of healing wounds.
She wasnt madam Pomfrey. Meaning, while she had a general knowledge of various spells, she did not have the expertise in healing specific spells to be able to heal a death wound on a house elf. Their physiology is very different from wizards.
Case Study: Dobby in "Harry Potter and the Deathly Hallows"
Dobby, the house-elf, is fatally injured in "Harry Potter and the Deathly Hallows" when he is stabbed by Bellatrix Lestrange's enchanted knife. The severity of the injury and rapid blood loss make it difficult for Dobby's friends to save him.
For a wound like Dobby's, it was unlikely that either thing could have saved him. Also, the act of apparition is a highly taxing activity. The fact that Dobby was able to apparate three people plus himself while bleeding heavily, it would have been a miracle for him to survive.
Hermione is silent, implying she didn't have her healing potion with her or she knew Dobby's injury is too serious to save him. All in all, it probably wasn't in anyone's power to save him.
Why didn't Harry use magic to bury Dobby? Dobby was a dear friend to Harry, so he wanted to provide him with a proper burial. Hence, he refused to use magic to bury him.
Harry asked if he could help Dobby but he began wailing and talking about how humble he was and how brave he was for facing You-Know-Who twice. Dobby finally told Harry why he was there - he had a warning: he shouldn't go back to Hogwarts School in September because he would be in danger.
He has grown afraid of Harry's connection to Voldemort. Perhaps Voldemort, knowing Dumbledore's love for Harry, would possess Harry and provoke Dumbledore to kill him. So, Dumbledore attempted to avoid Harry throughout Book 5 for Harry's own good.
In the Deathly Hallows Part 2 (2011), why didn't Snape heal himself after Voldemort's attack, […] Because he was bitten in the throat by a snake whose bite is cursed (see what happened to Arthur).
Dobby broke his promise.
Now it's just tragic, because Dobby returned to save Harry's life one last time and died doing it.
When Dobby's last words before dying in Harry's arms are "Such a beautiful place, to be with friends. Dobby is happy to be with his friend, Harry Potter."
What was the lotion/potion Hermione put on their hands when they emerged from the water after using the dragon as their getaway ride? In the book, there are two curses on the objects in Bellatrix's vault. If you touch them they multiply — and they burn you. She uses essence of dittany to regrow skin on their hands.
Because Bellatrix's wand was reported as lost at the Malfoy Manor where the trio ended up taking it away to Shell Cottage, so showing it would have immediately revealed that Hermione was only Bellatrix in disguise, as the real Bellatrix didn't have her wand. Personality.
In Harry Potter and the Chamber of Secrets, Dobby is freed from his servitude after Harry tricks his owner, Lucius Malfoy, into gifting him a sock. Dobby wears that sock throughout the rest of the series until his death.
According to the WOMBAT test, it is possible that house-elves have an average life expectancy of 200 years, cannot be ordered to kill themselves, breed infrequently and only with their master's permission, can override wizard enchantments, and have an allegiance to their home rather than its inhabitants.
Ultimately, Hermione discovered the means by which Rita spied on others and forced her to "keep her quill to herself for a full year" by catching her in her beetle form while she was perched on the Hospital Wing window and trapping her in a jar imbued with an Unbreakable Charm so she couldn't transform.
A Professor at Hogwarts School of Witchcraft and Wizardry, Snape is hostile to Harry due to his resemblance to his father James Potter, who bullied Snape during their time together at Hogwarts. As the series progresses, Snape's character becomes more layered and enigmatic.
Harry's scar had hurt during Arrival Feast because of Quirrell's connection to Voldemort; Snape was then talking to Quirrell, allowing Voldemort, from the back of Quirrell's head, to sense Harry's presence.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
Because he and his family defected from the Death Eaters they were pardoned for their crimes after Voldemort's final defeat and did not serve a stint in Azkaban.
He didn't block it. He enchanted a statue to jump in the curses path to be hit instead of the curse hitting Dumbledore. There is no way to block the curse - otherwise countless people could have easily been saved. The Abada Kedavra has no counter, cannot be blocked and is irreversible.
Dobby has never been asked to sit down by a wizard. Harry comments, "You can't have met many decent wizards" (2.20). Dobby agrees, and then starts banging his head on the window to punish himself for speaking ill of his family.
Harry denies the praise until Dobby makes reference to Voldemort (calling him "He- Who-Must-Not-Be-Named"). We learn that Dobby wants to prevent Harry from returning to Hogwarts, as danger awaits him there. Harry protests, but Dobby will only respond by nodding or shaking his head.
Dobby Had Insight Into Lucius Malfoy's Plans
Being a House Elf to the Malfoy family, Dobby was privy to the happenings at the manor. He could overhear conversations and likely even saw important documents regarding Lucius' business.