It is a sad things happened to Momoy for such a long period of time.
I never experienced this before after neutered, which makes me feel so lucky. I seldom here people's cats has problem after the surgery too.
I have the hard feeling that momoy sickness is continue after one and another. from her uterus part, then surgery, then jaundice, and now sound like she is dehydrated.
because, since you said u have to spoon feed her with water and food for 10 days, this means she is lacking with water. by nature animal body is made of 60% water. cat or other animal can easily get dehydrated. the one u see, the skin lambat anjal is one of the sign.
how about her mouth? if u open it, did u see dryness? or its shiny and watery?
how about heart rate? is it increase? if u have other cat, try see their different.
sick/fever cat will always have the potential of having dehydration, due to lack of water.
shock and blood loss can also be the cause of dehydration.
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one way to save on food is, u go to the market right, buy chicken meat. normally chicken Brest.
go back home, get some of it, cut some of it. and boil it with empty water. not too much water..
after it boil (not too long, not too fast... medium cook), cut it into pieces...small small one...
now get your wet cane food. any brands also can... take abit of it.. if momoy at 2 spoon of wet food before, now u only take 1 spoon, and mix it with 1 spoon chicken meat.
the balance put in tight container inside fridge.
the chicken soup (water u used to boil), dont throw away, use that as a drink. it is good for cats.
Have u heard about peronitis? I read somewhere that pyometra can lead to sepsis and peronitis. Is peronitis = FIP? Do u think Momoy is showing peronitis symptoms?
Owh, i think i've read too much and psycho-ing myself la..