Our expert says:
A common mistake is to base such a motivational scheme primarily on Punishments, rather than rewards. One could devise a similar scheme, in which performance markers, at home and school, were set, with her having some freedom to select how to achieve them, and with a baseline of NO privileges - no cell-phone, no internet access, no television, no outings, etc ( depending on whatever she values most ) and with a clearly stated facility for here to earn back each of these, for the month ( she'd need to re-earn them each month ) by achieving a specified set of mileposts and goals.
Misbehaviour, like lying, forging mom's signature, etc, would mean a loss of one or more of the privileges, and needing to re-earn them for the current month.
She might say that if you said she could plan her own studies, that meant she was free to plan not to attend the extra lessons, one reason that particular condition wasn't quite phrased right.
A psychologist who works with young adolescents could help assess her and help you plan a more detailed system to encourage her to come right.
Another major point I often find overlooked is simple and vital - try to catch her doing something right - giving her extra atention and praise for whatever she does right can be surprisingly more effective than nagging and falling into the trap of only giving her attention when she does wrong
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