I would follow all the advice above except the skateboard but emphasise after the wing on land, sup in water with no foil - I'd get her behind a boat to foil. THEN. Back on the water with a board and foil. Not totally necessary but it will Drastically speed up the learning curve on foiling and hence may keep her engaged.
those that learn to foil and use and wing at the same time (seen it done many times) works, but they were all experienced watermen and accepted the punishment, disappointment and walks of shame.
also once on water - if possible - makeher do king downwinders with a support boat, jet ski if possible. That to will drastically increase the leaning time again. Less time paddling in and walking back with a huge. Board.
ps my son was 13 when I taught him although he had kited since 8 and learnt to kite foil at 11. So I just gave him a board / foil and wing and dropped him 10km up the coast and left him to work it out

he did and now he teaches me.