I think, the 34 year old woman knows what she is doing every day. She enjoyes to be seen, otherwise she would cover the window.
Next time when you meet her somewhere, you can mention about it, by saying, "Oh hello dear neighbour. How are you? Did you know that your bathroom can be seen from the other side?" Means, you have had your fun, and now you treat her like a gentleman, giving her chance to react, and chance to change. This can be the beginning of a wonderful friendship or .....
Yeah! My thoughts exactly...