I ended up finding some antibiotics and a steroid for her, she's much better now and has started eating and drinking. She's had five doses and is already back to climbing. I don't think it was intussuception which is good since I couldn't have treated that at home. She's always had a weak immune...
I think my cat has gastroenteritis. I will not be able to travel to the vet tomorrow and I would appreciate all the advice I can get.
She is almost one year old, very petite, and usually an active cat. Just this morning she came with me on my walk and was scaling trees and hunting her brothers...