I think my neighbour didn't see me watching
Why didn't the neighbor see you?
I hide behind a wall and she relies on touch
It's wrong to spy on your neighbors and violate their privacy. People deserve to have privacy in their home and feel safe without someone spying on them.
I don't think it's that bad. I don't do it that much.
Regardless if you do it a lot or not it still violates her privacy. If you are trying to get to know your neighbor you should try striking up a conversation with them.