I've never had this kind of abuse happen to me but from the way a lot of people write, I took ideas from that as well. The teddy bear she could normally care less about but when it comes from the heart of someone who truly cares about her, she'll except it with everything she is.
She's trying to fit in but it's hard for her. Maybe as the story unfolds she'll get into her family tree and figure out if her parents are actually her parents, or if it's one of those she was taken from her parents.
Yes, I realize she said the Millers were her birth parents but, again I can say she lied, or she just didn't know. So, my dear readers it's up to you how her story goes, should she stay the 'stupid American' she thinks she is or should she find out if she's actually Japanese and her memories were erased by Hatori.