Don't think that you're being silly if you take Izzy back to the doc's. I took Oskar on a Monday and he had a throat infection, but overnight he actually developed croup (I had a hunch from the sound) so I took him back next day. My doc never makes me feel silly and tells me that if I feel I need to go to him then that's best as they're babies

I think that for the simple answer... you are asking a question because I think you feel that you should take her back so I would do exactly that hun and don't feel silly about it at all. I hope she feels better soon. Oh and like Alan said, anything she is eating at the moment is better than nothing - I know that I favour some things over others when I'm not well.