I'm stuck in a very similar place. -
Devs, I don't know if this is a bug, but it is possible to visit Susan's house and start her story line. I don't know if that causes an issue, but I cant get to the "mum invites you to the bedroom" event, so the Mei massage story doesn't start. Now, when I try to talk to her during the day, she is in the kitchen, but no dialogue triggers. Is this as planned?
Having followed the above pdf walktrhough, I can trigger the mum invite and Mei event, so it is working, but it seems to me that if you don't follow a specific sequence, some flags never triggers, and might get stuck?