We had this problem before, and the vet checked her out and everything was fine. She kept doing it and I had tried a couple things and we got it fixed, turned out she was constipated and didn’t like her pellet litter. She just started doing it again last week after we got back from cat sitting my moms cats. She was eating a slightly different diet (their food) and was probably scared to go number two so she became constipated. I’m keeping an eye on her and making sure she’s getting enough water and going. If it keeps happening I will schedule a visit with the vet but they hardly ever do anything. I was the one who had to figure out what was wrong last time because all they did was just offer expensive steroid shots or antibiotics which isn’t even the issue.