What's the Name of That Book??? discussion

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SOLVED: Children's/YA
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SOLVED. YA Sci-Fi about a girl kept in a top-secret jungle compound, falls in love with cute boy from the other side of a fence. Spoilers.
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Jessica Khoury (other topics)Jessica Khoury (other topics)
Jessica Khoury (other topics)
the cover was very dark green with lots of ferns on it, and it may have also had a jar, though i don't recall what was IN said jar. no character names either.
the main character is a teen girl who's some sort of science experiment (possibly to make her immortal?), and she's been raised by this big group of scientists in the forest. note: the scientists were actual characters instead of the usual faceless stand-ins.
she has no access to the outside until this kid from a nearby village finds the compound she's in and talks to her through this wire fence thingy. i also remember her secretly having a world map under her bed, and the scientists throwing her a birthday party near the end of the book.
there may have also been a big twist as to the mc actually being a member of some long-forgotten race of whatever have-yous. general vibe of the book reminded me of james cameron avatar and the portal series.
the synopsis seems like it could be about shatter me, but it definitely wasn't. thanks yall!