Lingerman,
Whenever a dog has swelling in the face or mouth area it is usually an allergic reaction to food, insects (bees, wasps), or some other product she came in contact with (pesticides).
Facial swelling is especially dangerous because it can restrict her breathing. Is she breathing ok? I'm thinking bees or wasps, because the face and paws are swollen ( she would have tried to swat and wipe with her paws), or a product she stepped in and tried to wipe or lick off.
You can use benadryl as an antihistamine, 1 mg per lb of dog given every 8-12 hours as needed. I would call your vet to double check, and if she has any trouble breathing at all take her to emergency vet.
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Warmly,
Chase
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