Is schizophrenic relative going to the toilet in her room?

F61 with schizophrenia living at home. She doesn't wash or bathe or shower. Don't recommend trying to get her to do those things because she won't and never has. She had a strong and smelly odour to her. Suddenly, she has a new stronger and much worse odour. On a scale of 1 to 10 it would be something like 78 and you can smell it before you even open the front door. Somehow I appear to be the only member of my family who's noticed that there are smeared feces on the walls near her bedroom. Anyway, when I first smelt this new smell I thought that someone else must've gone toilet and had a big poo. However, that person wasn't home. I've also noticed that she doesn't "go" toilet. Usually if someone went toilet you'd hear them close the door, a bit of quiet for a bit then hear them flush and wash their hands. Instead, she goes from her room into the bathroom, flushes it and goes back to her room all within a span of 60 seconds or less. I think that she's going to the bathroom in her bedroom and then flushing some kind of tissue down the toilet. Considering that you need to poo everyday it's odd that she never stays in the toilet for more than 60 seconds.