J.F.
Relax about it! I have a 10 month old too who is doing the exact same thing! One day he loves banana and will eat the whole thing. Then for weeks refuse banana and throw a big fit in his high chair at the mere suggestion. He went about 4 days with barely eating any food, just formula. Finally this morning he ate rice cereal like he was starving. He is my 4th baby and none of my others have been this way. However, because he is my 4th I am much more relaxed about it. I don't pull out 20 things from the pantry trying to get him to eat anything. I stick to my plan of what he is to eat and when. If he doesn't eat it, I throw it out or offer it at the next meal (it kills me to throw away food!).
It's ok if she doesn't eat. It is normal for her to do this. I know it's hard, but don't stress too much! She will be fine!