Have you checked her for possible grass seeds? One of my dogs, a Yorkie mix, dropped to the ground, during an evening walk, last Summer, and immediately began l licking at his paw. I couldn't see anything, bu the next morning, I took him straight to the vets and he found a large grass seed in bedded in his paw. Aside from being super painful, they have to come out, asap, otherwise, they can travel up the bloodstream, to the heart. My dog was able to walk around, but the swelling got progressively worse, overnight.
Have you phoned the vets?