Why don't you tell her you prefer your time and your space alone? There is nothing dick-like about that. It's a dick-like thing to come and invade your time and space because she is certainly exerting the control she has over you, especially with her looks. I can guarantee she is getting off on it.

Man-up Jim. This is coming from a female over here. Tell her if you want to spend time together we will make a date, but please do not invite yourself on my personal me-time activities.