Yes, she could be. Females can get pregnant at 8 weeks old. Treat her like she's pregnant for now, make sure she's on loose bedding as you won't be able to change the cage for 6 weeks if she does give birth. Make sure you have a good vet that you can get to any time of the day if needed in case she has any complications, especially with her young age. And read as much as you can on the Breeding & Babies forum. There's a lot of information on there! If you're having trouble finding the answer for a question (make sure you search well first), you can ask Nikki as she's currently the one who handles most of the breeding/surprise litter questions. Good luck! Hopefully she's not pregnant.