Unlike most of her Jedi predecessors, none of Rey's previous lightsabers were constructed by her personally. Anakin's was passed on by Maz Kanata, Leia's was given to her by Luke and Kylo's was taken out of necessity mid-battle.
Leia's lightsaber is also passed on to Rey, who uses it to help defeat Palpatine, given Leia another role in the defeat of the Emperor and salvation of the galaxy, before it too is buried on Tatooine.
Leia's lightsaber is believed to have originally belonged to her brother, Luke Skywalker. After Luke's tragic demise, Leia inherits the weapon and continues his legacy, becoming a beacon of hope and strength for the Resistance.
Before constructing her own lightsaber, Rey uses Luke Skywalker's first lightsaber, which is actually Luke's father Anakin's lightsaber — the most storied weapon in all of Star Wars canon. This is the Skywalker lightsaber seen throughout the original, prequel and sequel trilogies.
After burying them, an old woman (played by Annie Firbank) approached her. It's this interaction that has prompted numerous theories as to her identity.
The Little Girl
Long story short, she is Padmé's niece, Pooja Naberrie, and was portrayed by Hayley Mooy. If nothing else, you just learned a fun piece of Star Wars trivia.
Following Palpatine's final defeat and her own resurrection, Rey adopts the name Rey Skywalker to honor her mentors and their family legacy and renounce her lineage. As the last remaining Jedi, she makes it her mission to rebuild the Jedi Order.
After Skywalker's death, his Force spirit gave Organa's lightsaber to Rey, as he believed Organa would want the Jedi Padawan to have her weapon.
It's possible that Rey adopted the yellow-bladed lightsaber (or perhaps the kyber crystal conjured a yellow blade based on the changes within its wielder) in honor of those emotionally detached sentinels tasked with guarding the Jedi Order.
Rey reforged her lightsaber during the First Order-Resistance War, so when she did it, maybe she picked a yellow lightsaber because she wants to carry on the legacy of the Jedi Sentinels from ages past? After all, the Jedi Sentinels were chosen from the best of the best of Jedi Knights.
Encased in a distinctive silver-and-copper hilt, Leia's lightsaber used a naturally-occurring blue kyber crystal, much like Luke's original saber that he had inherited from his father by way of Obi-Wan Kenobi.
This can be seen in the novel starwars.wikia.com/wiki/Rogue_Planet. It's because of his mastery of sorsue (sorry for my bad spelling.) Well if you want the ACTUAL reason it because in the original 3 films the Green Light Sabre didn't exist until after Obi Wans death.
After the Battle of Endor, Leia trained as a Jedi with Luke, but left the Jedi path after sensing it would result in the death of her son. She returned to the political arena, where the New Republic had reached an uneasy peace with the remnants of the Galactic Empire.
At the end of the film, Rey returns to Luke's home on Tatooine, where she buries Luke and Leia's lightsabers, then reveals her own—decked out with a golden-yellow blade, a hilt that looks like it might've been crafted from her staff, and a cigarette-lighter-looking switch that turns it on.
Terrio describes Rey's journey to Tatooine as a pilgrimage honoring the Skywalker family heritage, saying: “Rey brings the sabers there to honor the Skywalker twins by laying them to rest—together, finally—where it all began.
That Rey finishes her arc with a yellow lightsaber is noteworthy. The Sentinels who made the color famous were masters in both combat and Force use, were often excellent spies, and made for exceptional defenders of the Jedi order.
Anakin Skywalker carried this blue-bladed Jedi weapon throughout the Clone Wars. After dueling his former apprentice on Mustafar, Obi-Wan Kenobi took Anakin's lightsaber and kept it on Tatooine for nearly two decades.
Rey Skywalker, once known only as Rey, was a human female Jedi Master who fought on the side of the Resistance in the war against the First Order.
In The Rise of Skywalker (2019), the final film in the sequel trilogy, Palpatine is revealed to be the mastermind behind the First Order and creator of its puppet leader, Snoke, as well as the grandfather of protagonist Rey.
The Yahoo article notes that Leia would have wielded her own lightsaber in the original version of the film, but after her death, Abrams was forced to abandon that idea and work with previously unused footage from The Force Awakens.
After the duel, in which Padmé was victorious, the weapon was wielded by Skywalker for the rest of the Clone Wars. Padmé used this lightsaber for many battles to come.
Affiliation. Kylo Ren's lightsaber was a crossguard lightsaber wielded by Kylo Ren, Supreme Leader of the First Order and master of the Knights of Ren.
She does not have a baby bump, her hand never goes to her stomach to indicate she's carrying a child, and there wasn't exactly any time for her to have conceived a child with anyone in the course of the film, including Kylo Ren/Ben Solo.
By the end of The Rise of Skywalker, Rey had become the last known Jedi of the Skywalker Saga.
Rey Skywalker
As the daughter of a clone of Darth Sidious/Sheev Palpatine and trained by Luke Skywalker for a short time, Rey had the basic skills to become one of the greatest Jedi ever. With only a short training window and being a young age during, Rey still performed amazing feats with the Force.