Cat with lymphoma not doing so well after sedation and doxorubicin

Will post much more detail later in the morning after I get some sleep (just got back from the hospital) but my sweet girl Reiki had very low blood pressure and a lot of diarrhea and had to be re-hospitalized tonight. I would appreciate any feedback, and also will share information on her treatment to anyone who may be in a similar situation! This is Reiki's third week of chemo, and before she received it we were given the good news that her blood came back free of cancer cells and that one of her tumors has begun shrinking. I am, however, very concerned as she was fine (playing, running around) for about 8 hours after chemo but was not well around 2 am when I took her back to the hospital. Right now the doctors are thinking it could possibly have been a seizure or reaction to this new medicine (the previous chemo was a different drug as they do it on a rotational basis). A few other things have been ruled out.

^One of the pictures we took of Reiki before Christmas and before we knew anything was wrong!

Second pic, after starting chemo and her legs were shaved!