I did a restart and now I finished ash level 2 and slave level 2 on hinata says to meet her Monday morning in class and it doesn't do anything even though I just did ash level 2.
That's weird. I just started a new game myself and went through Ash and Hinata's events. Everything works for me with both the slave route for Ash and the love route. Check the phone again. Maybe there are more events for Ash, or the Slave level is less than the Love level for Hinata, which would mean switching to a different route.