Invite her over to watch a movie, perhaps blaze if she's into it. Don't get anxious, just chill. Talk to her a bit, eventually as the movie's getting going, perhaps you would've already gotten closer. If not, put your arm around her waist, see what happens from then. If all is good, play it cool, keep up the convo. Then just go for it, put your hand on her cheek and kiss her. Good luck.