My Daughter's Pregnant Friend

My step-daughter was about 3 months pregnant at the time. We were visiting her and living in a house she was renting with her husband until they were ready to move out. We all slept in the same room. She and her husband slept on a bed and my wife and I slept on a sofa. It was about 2 or 3 am and we were all sleeping. We woke up to our daughter's friend Tina standing next to our bed. I grumbled and asked what she wanted. She said she just wanted to hang out. My wife and I were pissed that she woke us up. My daughter and her husband were also mad. A couple of days later when my daughter and her husband were out, Tina called me at the house and said she was worried about my daughter and that something was wrong with her. I was confused and asked her why she thought that. She said that my daughter's face was looking really weird. I thought that was strange and told her that my daughter was fine and that she was just saying weird stuff. She showed up at the house a couple of weeks later and walked into the room we were sleeping in. We were sleeping, but my son-in-law caught her and asked her what she was doing. She said she was just dropping something off for my daughter. He said she seemed to be repeating phrases to herself and mumbling. We decided to stop answering the phone. A couple of days later, my son-in-law said he was going outside for a bit. A couple of minutes later he comes back in, but I could hear him talking to someone. I asked who it was and he said it was Tina. He said she was standing by his car when he came out. I thought that was weird. I went to the window to see if she was out there. She was standing in the driveway staring at the window. I couldn't see what she was wearing because it was dark outside, but the next morning she called me and said she was just walking around the neighborhood because she had put on her nightgown and housecoat and walked out side to feel the breeze.