congrats on your new little girl Gracie. She is blessed that you gave her a home. I hope for her sake that she is not pregnant. After the vet appointment you will know more.
I would tell the vet that you want her seen asap bc you are worried that she is pregnant and she only weighs 4 lbs.
Any good vet will find a time to squeeze you in. Most vets set aside a few appointments for emergency and this should be considered an emergency bc you don't know when she will deliver or if she can.
Sending prayers your way and Gracie is a very lucky to have you in her life
