Katie, when you’re feeding food, I’d try a tablespoon of canned cat food, mashed down on a very flat surface (like the lid to a cottage cheese container). Drizzle a teaspoon or so of kitten milk replacer and/or some Pedialyte on top of the canned food.
If she doesn’t really show interest, when she’s watching, try swirling one of your fingers around in the food. Then, gently offer her your fingertip to lick. If she doesn’t lick it, try very gently touching her nose or upper lip; chances are she’ll lick it off.
If she still doesn’t want to eat, take the food and mix it thoroughly. Feed it to the kitten from an eyedropper, no more than 1/3 of the eyedropper per swallow. If she won’t open her mouth, put the eyedropper up to the side of her mouth and squeeze a little in.
This whole process may be a little messy! If you need to clean her up afterward, take a washcloth and soak it with very warm water. Wring as much water out of it as you possibly can, then clean her up. Then gently massage her with a dry washcloth; you don’t want her getting chilled.
Do you have her confined to a fairly small space? Are you stimulating pooping & peeing for her? Is she staying at a comfortable temperature?
Keep track of how she’s doing, and be sure to tell your vet if she’s still not eating by Tuesday morning. The vet may have suggestions as to what to do, in order to get her eating.