I’m thinking coccidia . Get that tested asap and make her eat something! Anything. 4 days is too long. Her liver enzymes will go up and she will sink more. Try droppers or syringes of rebound recouperation or Gerber baby chicken and gravy watered down with kitty lyte or plain Pedialyte. Some hills AD diet would be great but it requires a script from vet. 1 TBL 2-3 times a day will keep get safe.

Ponazuril will nuke the coccidia
So will TMZ