I think you know the answer. Maybe she's not sure you know the answer.
Maybe she's having you go through the "try cutting back" experiment to have you see yourself that you have an issue. This way she won't have to walk you though the "maybe I can control it" phase after she has you stop - she would have already shown you that control is not what you can do -
I'm sure if you told her you decided to just stop I don't think she'd care - just ask you why and then you'd be like "because I know I have an issue" and then - well you'd be on your road right?
Just some thoughts.