No she didn't catch you, if your door was open a crack its unlikely. She probably got up abit dazed and sleepy and went to the bathroom, and didn't even think about looking in your room. Its totally normal to watch porn, I'm a 20 year old female and have been watching it since I was 16. As for the dirty looks its probably in your head, your just been paranoid. My mum once found my dildo a condom, a wip and and bottle of lube in my room, put it all in a bag and hid it in my wardrobe. That was embarrassing.