She doesn't like them.
Doesn't know how to feel about them at all. Steven told her about his dads broken leg and she had a minor existential crisis about not having any bones.
But now she is extra careful when hugging Steven because she is terrified of breaking all of his bones.When she found out about bones she pretended to have them to see what it was like, and subsequently felt incredibly restrained.
She has yet to learn about double jointedness.