Looks pregnant to me! As far as I know, most pregnant cats are actually very affectionate.. But there are some who aren't. Make an appointment with the vet.. Cats are only pregnant for about 64 days. So she probably got pregnant right before you took her in... She will probably give birth in another month. This is just a guess... She may have gotten pregnant a month and a half ago so then she'd be do in 2 weeks.
The vet will be able to tell you how far along she is.