Jessica's surgery

About one month ago I rescued my two cats as a bonded pair knowing that they both had FIV, which is a feline auto immune disease, basically aids in cats. After taking them to their 10 day Vet check up, Lymphocytic/Plasmacytic Gingivitis Stomatitis was found in my one cat Jessica and I was told that it can be more common in FIV positive cats. I was told to go see a specialist in feline dentistry and oral surgery which I did and he told me that she has a gum disease which is progressive and can be very painful for her when eating and that the treatment is extraction of all of her back teeth. This seemed extreme to me at first but after some research I found that cats that have this procedure done are much more happy and comfortable after but if they do not they can be in pain to the point that they stop eating completely, basically get fatty liver and eventually pass away. I love my cats and I want them to be comfortable and live happy lives. Jessica is only 2 years old. She has stopped eating dry food for the most part and is obviously less content than my other cat. So I know this is bothering her. Myself as well as her sister kitty Priscilla, and my roomate Hannah (her other kitty mama) would be devastated if anything happened to her. So please help my sweet kitty Jessica to get this surgery and live a healthy, happy life.