As Andie said, Gracie is an indoor/outdoor kitty. She come in and goes out as she wishes. She cries at the door when she's ready to go in or out. We make sure she's inside before we go to bed because we live in a active coyote area amd don't want to risk her getting hurt.

Thank you for everyone's advice. Even though the vet linked the hairballs with her very upset tummy and diarrhea, I have found a hairball remedy that seemed to be helping before I had to take her in for the diarrhea.

She's doing good and is a happy kitty.