My 7 month old daughter has diarrhea what can I do?

I think that she might have a touch of the flu because she just started day care a couple of weeks ago. I have been giving her gerber baby food for over 2 weeks then 3 days ago she started to have runny poops and then yesterday she refused to eat any veggies or fruit (which she usually loves) and now she only eats her bottles. What can i do to help her?