Man, I find the problem..... omg, I've been stuck here from two months ya know!!!Okay no worries. So all I did from your save was have Monica turn down Steve. I then went to Biff, he refused to let Monica work. I then slept until Monday because Steve's office is closed on Sundays. On Monday tried to visit Steve, Monica realises she needs a better outfit. Then headed straight to the clothes shop where Monica will no longer run away and can go through what ever you choose from there.
I need to sleep in Basement that night. However, I used to spend my night in my aprtment in slum bc I want to cook sth to eat before I go to bed.
Hope this bug will be fixed someday. Thank you guys for helping me on this.