My friend did something odd

My friend whom I have had suspicions that my female friend maybe gay. We are both in our 30s and I baby sat for her kids today and after she returned from work she asked me to hang around for awhile to watch the kids. So she could shower. I said sure of course. She then called me to her room and she wanted to talk to me. I went and she was not wearing clothes. I was somewhat uncomfortable but I did not say anything. Is it normal for people to do this? I feel really odd but I want to be friends with her. I am 100% straight! What do you think?