I am not sure where you live but, here in NY you can only use a crossbow during gun season. I would recommend having her do shoulder exercises with exercise tubing. It will really stregthen her shoulder and arm quickly, probably not in time to get proficient this season though. Ethically, I would hope she would be a good shot before hitting the woods. Maybe take her out during gun season to get a taste of the hunting experience and work her up to her bow by next year. Or just take her out to the stand with you. I know watching someone take a deer can be quite an experience in itself.