Not an arm-swinger! I suspect this one will transition well towards a better swing pattern fairly well. Move the "center" of her swing out of her rear foot, and things may start shaping up nicely.
I'm very curious to see her progress.
When she was younger she would flatten the barrel early. I introduced TTB and this is how she developed so far. This off season will be the first time I really explain mechanics and use video feedback. And now they have Blast feedback as well and they love using it.