14yr old has earn’t 24 hr loss of privileges’ not going well

Dear Nicholeen Since doing the TSG Mastery course a couple of weeks ago we have been doing a lot of pre teaching with our ten children on the skills and the consequences. Now I have started implementing the consequences. Most of the children are responding well but my eldest 14 yr old has earn't a loss of privileges for 24 hours but is refusing to start her 24 hrs. She is saying "Make me" when I ask her to do some thing. She has told her sibling's that she just isn't going to do her 24hours. It has been 3 days now and she isn't feeling at any disadvantage because she is getting her way every day doing what she wants to and not doing what she doesn't want to. She will eat whatever she can find, go wherever she wants to and today when I told her to do something she said, "I don't have to, I'm out of instructional control". She has been used to power struggling with me for many years and winning, I'm not sure how to win this battle with her, I'm guessing that I just what till I have a special privilege comes along that I have got the control of to take away, and then she might decide to do her 24hrs. I'm worried that next time she will still power struggle for a long time as she isn't seeing the disadvantage greater than the advantage of getting her own way for days on end. I'm not sure how I can reach her heart, when it just seems to her like an opportunity for a power struggle. God bless you and thank you for your help.