How Long Should She Go On With The Chemo ?

My mum had ovarian cancer 5yrs ago, had all removed, but it has come back onto her bowel. She is 83 had chemo recently, which did not shrink it, now is having taxol added. She is feeling very sick not eating well. If this taxol still does not shrink it when she is next scanned, would her general health be better if she stpped the chemo. I am just thinking she will get weak not eating well all the travelling to fro the hospital. In other words how long should she go on with the chemo