"Suzy, you are 23 years old. If you want me to treat you as an adult (come and go as you please for instance) I expect you to behave like a grown up and treat everyone in this house with courtesy.

If you want to come home at 3 am you may not sulk around the next morning like a teenager."

If she works as a bartender (making money! not freeloading!) then she'd probably keep late hours regardless of whether she goes out afterwards. What kind of curfew would you give??

This isn't about the late hours; rather, this is about general attitude. I agree with POs who suggested you address that.