It’s most likely because she is in a new environment and is getting used to all of the sounds, vibrations, and smells. She is probably stressed and doesn’t want to eat. That’s what my rats did, just give her a couple of days, and leave food and water availableI got a new rat who I made a post about earlier and i’ve had her for a few hours and she doesn’t seem to be interested in food, water, or treats. I’m concerned because Ill be going to sleep soon but I wanna make sure shes eating and drinking before I do.