I would start her out on a small 4 stroke dirt bike, an XR80 or similar, try riding in a field then the trails close to home and hopefully she will get into it. Learning how a bike moves around on the dirt is IMHO the best training one can have, It's damn good fun too. Mind you there will be spills and being out on a grassy field is far, far more forgiving than being on the road. It will take time, be patient and get the dirt training underway and the confidence built first, proper courses, licence and suitable bikes will all fall into place thereafter. Good luck and happy trails.
I spent all my money on Bikes n Beer. The rest I just wasted.