I have a weird story similar to that. I was around 9 years old and I was at my uncle's apartment in the morning. My cousin, my sister, and I were talking in the living room and we were facing the hallway.

While we were talking, my younger cousin said that he saw something in the hallway. I looked at the hallway and didn't see anything. He was really insistent so my sister watched the hallway (I didn't because I didn't believe him). Then my sister said she saw something in the hallway too. They both told me to watch the hallway, so I finally did.

After a couple of moments, a lady in a black dress quickly zoomed out of a bedroom, went across the hallway, and flew into the bathroom. I couldn't believe my eyes - she looked just like my aunt. Her long black hair was wild and wavy and her body was transparent (I could see the blinds and the morning light through her). She was facing us when she flew as well, like she knew we were there and she was watching us. It creeped me out how I couldn't see her feet (her body faded towards the floor) and how big her appearance seemed to be with her hair and dress. We kept seeing her fly between rooms after that, but she never entered the living room where we were.

Of course, I was a huge scaredy-cat and told my cousin to go ask his mom if she saw the lady (the lady had flown out of the room the aunt was in when I first saw her and they resembled each other). My cousin came back and told us that she hadn't seen anything. I told him to ask if she was in the hallway. She did not go into the hallway. I told him to ask permission to go outside. She also told us not to leave the apartment. Still, fear got the best of me and I fled and stayed outside lol. Now I'm creeped out again just remembering it. Also it's almost 2 am here.