What can I expect of my moms extreme low weight?

[Ms BW]

My mom is 5'2" and 78yrs old.  She weighs 80 lbs is a smoker and works 20-30hrs a week.  She has had a thyroid problem all her life and I suspect her meds need adjusting, however she will not see a physician.  She says she eats plenty.  I don't live near here but I have photos and testimony as to her weight.  My question is:  How much longer can she live like this?  Doesn't your heart fail at some point?  What can I expect.  I'm afraid for her but she's stubborn and won't budge.  Aside from this she is of sound mind.

[hanaguchi]

The physical description could have ben for my aunt. She is 78, 5feet 2" and is 82 lbs. She doesn't smoke but lives alone and is very physically active. I don't think the weight in itself is an issue. My aunt used to weigh 76lbs for a long time and only recently did she gain some weight. Your mom should definitely see a doctor to make sure she is okay but don't worry about the weight.
It would be good if she stopped smoking but you will probably have a tough time convincing her of that.
Good luck.