Hi there, you could give it a go - just be careful that she wears a full wetsuit or lycra covering knees and elbows, as the anti slip when you are kneeling or falling can really hurt - I've never tried to use such big/long boards with a wing, although plenty of people learn with a beginner board+wing (but they are not foiling it, just displacement mode). Be a bit careful as it's a very big board and if it flies away with the foil etc, make sure she is wearing a impact vest and I would even put a helmet on for the start..?
I'd imagine it will be quite hard to find the balance point with the wing being so different to a rig in terms of trim - def put the foil all the way fwd yes. and be careful!