Its hard to say if she does not favor it. I give my dogs a 3 day rule (unless it is obviously an emergency). If whatever it is is still bothersome after 3 days I would get it looked at. If possible try to make her let you look more closely at the foot. It could be many things like a sore, cut, thorn, sprain, hurt nail, allergies or boredom. I hope she is better!