As above really. I cannot believe that someone you refer to as your best friend can be allowed to just sit and wait for the inevitable.

She has a chance, so just take her to the vets. Simple as.

My Mum has just had to make the painful descision to have her German Shepherd put down. He was 13 years old and his head was writing cheques that his body couldn't cash. He was in a bad way and struggling to stand up, poor thing. He couldn't control his bladder/bowels. It is heart-wrenching and an awful prospect, but when they need veterinary care, you should get them sorted and if their suffering is so bad, you should allow them a little dignity.