This is way beyond normal teenage behaviour & it is going to take more than just grounding her.
I am a tough love single Mum to 2 boys & if it were either of my children doing this I would contact the local Police & ask them if they could “talk” to them & show them the jail where criminals are locked up. The Police will be more than willing to help you so ask them how they have handled this sort of thing in the past & would they be willing to go along with a tough love talk/action. I would march her down to the cops & show her where she could end up if she continues to steal because the day will come when she steals from the wrong person & is caught, the Police are involved for REAL.
A counselor might be able to help but it sounds like she is pretty savvy about the whole situation & will probably just say the right words to them so it seems like she is going to stop stealing.
If you do nothing more than grounding she will become even bolder & progress to something more serious & end up in jail for it.
Published 5th April 2020