when I was young I accidently saw my brother's mother in law naked and she smiled and winked at me

I forgot how old I was but I remember my mom and stepdad had to leave town for that night and my brother's girlfriend offered to babysit me. she lived at her appartment with her mother and three other sisters.

I was watching tv in the living room while my brother's gf and her sisters cooked dinner, the kitchen and the living room were fused. so her my brother's mother in law when to take a shower. the bathroom was down the hallway from the living room where I was sitting. she then finally comes out and when to her room to get change, of course she wore a towel at this time.

so as she got in the room my brother's gf and her sisters continue to get dinner and then she their mother shouted something while in the room getting change but they couldnt hear her. they responded "what" so she then leans out the door still naked and repeats herself in order to be heard. it was then that I looked her direction and I caught her naked as she leaned out the doorway. she caught me looking and then smiled and winked at me.

till this day my curiousity kills me here. obviously I still enjoy remembering such an experience but I wonder why did she reacted this way, I wonder if she would react the same if that happened now.