I enlarged your picture, and I am not certain but it appears as if she may have canker or Trichimoniasis. Gently open her mouth and see if there is a caseous build up in the corner of her mouth. Do a search on this condition to see if that is what she looks like. Metronidazole is a very effective treatment.
Looks swollen on inside of her mouth also don't know what caseous means but nothing in the corner of her mouth just lump on outside and small lump on inside
Nope, just a swelling on inside that looks like outside only smaller and warm to the touch. Don't know if I should just watch, noticed it yesterday doesn't seem bigger today or try to drain it with small syringe or antibiotic. I have Tylan 50 or Duramyacin on hand