What's another word for unbelievable?

Mom just left the house in an ambulance. She was pretty incoherent but she knew where she was headed and was unhappy about it. She's been tired since chemo Friday, but a home nurse came by today and checked her vitals, pronounced her fit and said, like everyone does, "you look good!" An hour and a half later Mom thought it was 1908 and couldn't move under her own power. I talked to her oncologist and he suggested letting her rest for a couple of hours and watching her carefully. About two hours later she felt hot and had a temperature of 101.6, so I called 911 right away. Infections for chemo patients are really serious. I'm on my way to the hospital just now...

This is hard.

Love,
Dave