Did she have parasites? Or is the Vet still unsure of problem. A very ill
cat (intestinally) who cannot hold food down will often tolerate clear
chicken broth and 'oat water'. Cook very watery oatmeal, strained to obtain
& feed the resulting oat-water. This is soothing & healing for the stomach,
liquid can be given  by spoonful, they seem to like or know the broths will
help them. Also yogurt is beneficial and can aid/maintain recovery of
intestinal health, I recommend all cats are given yogurt (as will Vets).
Watch no cat-poisonous substances around and try canned Wellness as it is
all natural has many ingredients to improve intestinal health and no
chemicals or bi-products. I noticed a few of your prev. postings (was it
you?) with Blue, AND the JEALOUS CAT? if so & Blue eats mainly dry Nutro is
no.1 for urinary & intestinal health fed along with canned Wellnes - hard to
beat! Costs but saves in the long run. If your Mom has the Jealous urinating
cat I understand as one of my 3 cats (sisters) is insanely jealous & goes to
extremes when jealous. Takes 'fits' screams & scratches things which causes
the other 2 to pick on her afterwards - like when she's in the litter box -
which made her want to avoid the box. Solutions now have 2 indoor boxes &
3rd yard sandbox  in fenced yard. No more box problems as they can pick &
chose & when not getting along will use alternate box - also jealous cats
have to be trained with mega positive reinforcement - like simultaneous
patting & verbal & playing to show both/all that Ma & Pa love em all!!
Please let us know how your kitten is coming along & I answered your prev.
posts as the issues didn't seem resolved.  Hope your cat is better. Mari!