Vet. ASAP.
I don't think there's anything you'll be able to do for that at home, especially if the mass in her mouth has ruptured or suddenly gotten a lot bigger. That doesn't look like a typical mouth infection IMO, so my money is on it being related to the pre-existing mass in her mouth.
EDIT: I didn't notice how pale the skin was inside her mouth. Could just be the pictures. Hopefully nothing is restricting bloodflow to her mouth.
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