My question is how do I get her help

Her feelings aside there is nothing you can do to force her into treatment or convince her to get treatment. She is an adult and unless she is deemed in court to be mentally incompetant she is in charge of her own physical and mental health decisions. unless she is a danger to herself and or others there is nothing you can do.

In the event that she does become a danger to herself and others you can transport her DURING the dangerious situation by yourself or by police escort to the local ER where she will be evaluated by two staff psychiatrists for possible inpatient involluntary commitment to the local mental health unit for 72 hours. At the end of the 72 hours she will again be evaluated and released or held involuntarily on the unit for 14 days. At the end of that time she will again be evaluated and either released or transported to a more secure and long term mental health facility.

She is an adult and by law that saws she is the one in control of her own mental and physical treatment plans. You can talk all you want, you can plead you can bribe but the ultimate decision is hers and as long as she FEELS she is ok no amount of talking pleading bribing and so on is going to work. FEELINGS just are. Someone can tell me that THEY feel I need help but if I don't feel I need help its not going to happen even if I enter therapy just to please that other person.

My advise leave your mother alone. Enjoy what time you have with her. You are her daughter not her mother. so be the daughter and leave the care taking up to her and her husband and if she really does have a mental problem then at some point she herself will reach out to get the treatment she needs. Sometimes older people talk other peoples ears off so to speack because they are loney and just want to be a part of their childrens lives.