Hi Craftylynn-
Welcome to the site. Sounds like your mom is having a little rough patch after her surgery. My husband is 72 years old. His heart surgeries have been fine and his recovery from them was on target, but he has had some very, very serious other medical problems which landed him in the ICU several times for over a week. And there have been times he was even close to death. He has also been in kidney failure, and just missed dialysis by the skin of his teeth. Now he is doing well.
There are also a few others here who have had to be put back on the ventilator for a time after surgery, for various reasons, and who have had severe problems.
I am telling you all of this because I want you to know that it is possible to have a good recovery from situations like you have described. It will just take a little while longer for your mom. It sounds like her doctors are working very hard on her case to straighten things out as they come along. They know what to do.
One of the most important things you can do for your mom right now is to make her believe that she will get over this hump and will eventually recover. You don't want her to lose hope. It will make a world of difference. When Joe was in such terrible shape, I spent as much time as I could in the hospital. I tried to be there when the doctors made their rounds so I could hear first hand how Joe was progressing. I also put on nice clothes, fixed myself up and walked in with a smile and a joke, and the morning paper. I told him about the neighborhood gossip, anything to normalize his situation, and give him the feeling that I was SURE he would recover, even if I was scared most of the time. I did this even when he was "out of it". I still talked to him and encouraged him.
So hang in there. And we'll all be here for you when you need us.
Take care, and God Bless.