Ok, I agree to some extent with what some of the others are saying. However, having much younger ones in the house does/should play a role in the house.
As one mom said, what are your state laws? That's what curfew would be, this takes it out of your hands, the law get's final say.
Stop tracking your DD, it's okay to have it, but not use it for anything other then a true emergency.
She is living as an adult, she should be taking responsibility for herself as an adult. As others have said look at it like a roommate situation.
At 17 she can move out if she chooses, while 18 is the 'magic' number most states allow for 17 year olds to move if they wish.
Draw up a contract of what you expectations are, with her input and compromise with her. It's not about you getting your way, nor her getting her's. The house is everyones home, the rules need to apply so that the home as a whole doesn't get disturbed. Even my 21,20,20 and 19 year olds know that curfew is midnight. There are exceptions, but that is the rule, otherwise they wake up my younger children. They understand that, but if I just said midnight cause that's how I want it they would have an issue.
Your DD is not far off from adulthood, this final year isn't about being right. It's about preparing her to be on her own, and sometimes that means you have to let go and loosen the strings.