basically, I do this. First meet, be kind to her in the dialogues, etc. Second, after finishing her quest and going to dinner, don't try to grab her boobs and don't use the dialogue asking about her living alone, etc. I believe it's the third dialogue. I know some ppl and even the walkthrough may say you can do it, but don't. Be respectful. The third time, just talk to her and follow her, leave and come back later. Then, finally, after you return, tell her the truth that you followed her. This should trigger her first scene where she'll be drunk and make her move on you.
The dinner, outside of being nice to her before, is the most important step. So be careful here and even make a hard save before it just in case.