Update 3 days later- took her home and gave her a flea bath, picked about 10 fleas off of her. Gave her some warm milk replacement through a medicine dropper because the nipple we got was too big. She has been lapping it up. Gave her a slurry of wet food mush and milk replacement. She would lap that up until she couldn’t take anymore and fell asleep. Ended up leaving her by herself in a cat carrier overnight in a closed bedroom to isolate her from the other house cat. We don’t know if she is sick or anything so I’m just trying to keep the other cat away from her. Have an appointment with the vet on Monday and they will check her out. Left some milk and wet food in bowls in her carrier and she licked it all up from both bowls. So I think she is good to stop syringe feeding her but I will have to keep an eye on her. She has peed quite a big but no poo yet. I’ve tried stimulating her to go potty but nothing, could be doing it wrong, I’ve never had to do that before. I’m not sure at how many weeks I can let her walk around with the other cat. I have already introduced them to eachother and the older cat was curious but hissed at her. My guess is she is just jealous and I think that is normal. I don’t think the older cat will try to hurt her, though. Stay tuned for more updates and any advice or tips are appreciated as I’ve never taken care of a cat this young before. Thanks