Not sure if she knows.
My neighbor is a very nice looking woman, About 40 I would say with a nice body, After a year and a half living next door I accidentally realized that from my balcony I can see into her bedroom, I see her on average probably 2-3 times getting ready for bed standing at the sink in the attached bathroom brushing her teeth naked or putting on her pyjamas, I don't think she knows I watch her and don't want her to do anything to change it since I obviously enjoy watching her, I only see her in the reflection of the bathroom mirror but she has a great body for an older woman from what I have seen, Going out today to buy some binoculars.
Dont be a creep and just ask her out.
Invasion of privacy, obviously means nothing to you!