After the battle of Geonosis, Anakin Skywalker handed a small and rather traumatized little girl to his master Obi-Wan Kenobi. Kenobi, realizing that the child had most likely been orphaned during the battle and didn't have a place to go, decided to take the girl back to the Jedi temple with him. The Jedi could determine her fate later, until then he would make sure that she was well fed and cared for.
After a (in the opinion of the Jedi) long overdue midichlorian count revealed that the child (once trained) could become a very powerful Jedi. The council, after much debate, chose to keep her; having decided that her being four years old, while normally too old to accept for training, wouldn't be a detriment in her case.
Content with their decision on the fate of the four year old Lena Fett, the Jedi placed the child with the other younglings in her age group. While the girl currently seemed unhappy with her fate (lashing out at all who came near while screaming that she didn't want to be a Jedi) they believed that the child would soon warm up to and even like the idea once she got used to it.
Lena on the other hand, had decided to escape.
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Author's Note: This is a story of Lena's years at the Jedi temple. Some chapters have been edited and/or rewritten on 10-6-08