My mom is having really bad pain in her left ear and on her left tooth I'm concerned about what could be wrong. It has been going on for weeks now and we have tried many things. What should I do?
P.S. she has type 2 diabetes could that be the problem?

I think a trip to the dentist would be in order. Sounds like she may have let a bad tooth get infected; don't forget type 2 diabetes, or even type 1 are auto immune diseases that effect the immune system.

I am not diagnosing, as it is impossible to do on the internet, but it is obvious that is dental related.

I had ear pain from a tooth once. In my case it was a nerve from a tooth that ran up to my ear, nothing wrong with my ear. But she could also have an infection in her tooth that is spreading. She sooner she sees a dentist, the better and probably cheaper.