Why does my cat have the weird habit of hanging out in the bathroom?

My kitten rosie is a little less than a year old. For some reason, she goes inside my bathroom and just stays there for a few hours, and later I find the toilet paper all tered around, and her laying there on the rug. Why does she do this?? The bathroom is warm, but I don't think her reason of going in there is to stay warm lol.