What Hogwarts house should my character be in?

Her name is Rosetta Jayne Weasley. She is the twin sister of Ginny Weasley. She often feels left out because all of her siblings are in Gryffindor and she's not. Only Ginny, Fred and George talk to her kindly. The rest of her siblings either ignore her existence or are rude to her. Her parents don't treat her quite like her siblings. Harry and Hermione don't particularly like her, solely because Ron doesn't.

She can be nice if you're nice to her. And she always sees good in people, but also sees the bad. She has a hard time fitting in with people. Not just because she's a Weasley that's not in Gryffindor and doesn't have red hair. But because she's odd. She likes weird things and believes in the creatures that Luna speaks about (Although she's never dreamy like Luna). She loves to fly and especially loves to climb trees. So, what house should she be in?