J.C.
It could be hand/foot/mouth. Does she have a fever? Look at her hands and feet closely. Do you see any blisters? Will she drink? If she won't drink or eat, it could be a sure sign. Call the dr and he will tell you to give her pain reliever and wait it out.
Or it could be a popped taste bud - those can hurt.
If you do think it's hand/foot/mouth - WASH your hands and everything she touches. It's not for kids only. I had it when my daughter had it and I thought I was going to die I was so sick - high fever and just needed to sleep.
Good luck!