It won't happen immediately, it can take a few days, before she buzzes you709. Once you get the messege, go to Michelle's place after 20:00 and sneak to the backyard.
this scene doesn't show
I have knocked on the door and I have waited her message. once I get it I have gone at her home at 21:00 or later but never happen like written at point 709
707. Go home and to Jason's room. Keep going to Jason's room until you get a message from Michelle where she invites you to her home. (Jason will get the massage within the next 7 days.)
also you might want to download the updated walkthrough from my link in my signature, the one you have is for the 0.36beta, 0.36Final has some change have been made to it.