No more chemo?

My Mom has been chemo since June 22nd 2010. She had 7 rounds of carbo/taxol three weeks apart, 13 rounds weekly of a clinical trial and now she has had four treatments of doxil three weeks apart. Debulking surgery Sept 2010 was unsuccessful. The oncologist at the time said 12-18 months.
Her last chemo mom was very upset. She is down to 83 lbs (this is nearly a 7 lb loss from the month before) and she was just anxious, scared and sad.
Today she told me doesn't want to do it anymore and has been thinking about it for a few months. I asked her if she knew what not doing it anymore would mean and she said yes, she knows she will die. God, this makes me so sad. It's not fair.
Of course she was crying and so was I. I told her I would support whatever decision she made. She promised me not to tell anyone, she said she mentioned it to my Dad once and he told her she was being ridiculous. I don't believe my Dad really knows how exhausted my mom is, since he is blind he can't see her to know she is woren out.
She also said this is what she wants most of the time but not all of the time. I told her if she decided she didn't want chemo anymore then she probably could not change her mind down the road.
I don't know how to help her, she is so scared. Everyone is my family is at a loss what to do. My Dad wants her to be get her nutrition through an IV and Mom does not want this. I can tell but she will do it because it's what he wants. Apparently, he will call tomorrow to find out about this.
Part of me wonders if it's been worth it for her. She has done all this chemo and for what. She is worse off now then she was last summer and it is killing me.
Kelly