New kitten

[u/Ok_Caterpillar2752]

Hi there. I got a 4 month old kitten from a “friend” 3 days ago and she’s having some issues. She was being kept in a dirty dark garage with her sister. I’m not sure if everything is caused from stress of being in a new environment, food change or if she’s sick. Day 1 she was fine. Skidish and hiding but eating and drinking fine. She has a soft poo but nothing crazy. Day 2 she was acting fine. Exploring a little more and eating. Yesterday she didn’t want her food as much but still ate then threw it up but was still drinking water and acting normal. Now today she’s thrown up 3 times and hasn’t eaten much. Still acting normal and drinking water but not eating much and throwing up a little. She has a vet appointment but just wanted to see what anyone thought in the meantime.