jessiblah

I'd say it was something to do with Nelson or the desert that had her not wanting to wear dresses. Like say when she was surviving in the desert she got more tomboyish and her personality changed, because the last she remembers is the Nelson bit. In the desert when she was out there thinking about the whole Nelson thing and her brother dying, it made her upset but tougher and somehow turned her into who she was with Case. Because she doesn't remember being in the desert and she doesn't remember going through that, she isn't that person so now she's gone back to the more feminine Tamara with her original personality from before the desert.