For example in the last update in V6, Monica:
can go to hostel and participate a gangbang to pay her debts to the woman;
or she can fight with Misty and not go there, and that quest line will disappear.
there is no threat or concequences if you don't go to hostel and not follow Misty's request. So she doesn't need to. But we choose to go anyway. This is slut choice.
I don't know 2 years ago when you were arguing whore/slut issue, but right now it feels she is definitely more slut than whore.
Come on mate, she does porn, almost doing dp gangbang regulary

and she can now fake her that she is Monica's double in every complicated situation so she is more free now.
What does a character need to do more to be accepted as a slut

only thing prevents this, is her grumpy disgusted sex face but I am saying this is not align with her current slut status.
In the beginning episodes, yes she was not slut.