Hi and welcome to YT
. Glad you found us.
PLEASE, please get this girl to a vet ASAP! She is likely in excruciating teeth pain due to what has happened with her mouth at this point. Rotting teeth is no small health issue and can cause abscesses / infection that go into the adjacent bones, systemic infections, and permanent heart damage. Have you ever had tooth pain to the point where it was excruciating? Let me tell you, it gets to *that* point LONG before the tooth will actually fall out. So, I can't even imagine the pain your girl has been quietly suffering through. Please get her in as soon as humanly possible.
Best of luck!