I'm not a programmer and can't give you a definite answer, but if you send my your save file, I can look at it and compare with my save file and see if any flags are different.
If you've done the yoga where she's distant, then later that day rejected helping with dishes, and that night sleep naked with door closed where she just walks by your door. The game should automatically give you a messsage saying something like "Something's up with Mom, maybe I should send a fake email to find out what's going on." Something like that. Try to do all three in the same day. If it doesn't trigger let me know.