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Thank you for your question. My name is***** I have been a small animal veterinarian for 13 years and I'd like to help with your question.
The picture is not super clear, but I can see the location of the swelling. In that region the most common cause of swelling (usually mildly to moderately painful) is a tooth root abscess. The roots of the upper teeth extend upward the infection tends to move up under the eye like that. Do you know if your dog has bad teeth? Other potential causes include any kinds of bite wounds (insects, snakes, etc), but that would be less likely.
Warm compressing can help, but it isn't surprising that she won't let you. If this is a tooth root abscess, ultimately the only fix is to pull the infected tooth. If she is comfortable now, then just monitor her, but take her to a veterinarian ASAP so they can check her teeth and proceed from there.
Did the teeth fall out or were they extracted by a veterinarian?
If they fell out then there is likely a piece of a tooth root left behind from one of the teeth that fell out. She will need some antibiotics and X-rays to see if the root need to be removed.
They may find multiple pieces of tooth root left behind. Treating them could be a big ordeal, but the abscessed one needs to be taken care of at a minimum.