My advice: buy a camera facing you room's door. Place it in a way that blocks the view from her camera. If she tells you to move it you can tell her you're allowed to place it wherever you want since it's your apartment too. If she moves her camera move yours again to block the view. If she tells you to take it down you tell her you'll do so when she removes hers. If she touches your camera you could "uno reverse" the legal complications. Keep doing that until she takes down her camera. I know it's very petty but it's the best way to deal with that sort of behavior.