I agree with Mazing. How long has it been since she's seen a doctor? Do you think she'll take offense if you suggest it? Will that trigger her?
How close are you to your Mom? Can you sit her down and gently talk to her and kind of throw that in where she would agree to go? Perhaps you could go with her. In fact, that would be a good idea, because she won't hear 1/2 of what the doctor says, and probably wouldn't tell you anything he said anyway.
It really sounds like she need therapy big time. She may even need medication, but only a professional would know that. I wish you the very best. I hope you'll keep us informed, as we'd surely like to know. God bless and please take care. Hugs, Lee