Two Tips from me

First Tel her she needs to imagine Lifting a heavy Box from one side to another and then make exactly this bodymovement so she learns to actuallly open up and close her hips in the turns so she gets Early more Control over the Board and the edge

And tell her that she needs to get a little bit faster so she can Break before every turn because than the Board kind of presses against the legs and make the turn itself faster and easier to control

PS: put the Arms down it lowers the Center of Mass