ORIGINAL: Bob H in NH
40-50 is more than enough weight to take anything, well except some dangerous game, around. Possibly a moose is on the outside edge.
She has to be comfortable with the weight and fit, MAKE SURE IT FITS, my wifes first bow was way to long in the belief she needed more speed. She never shot it well. Get the right draw length and a draw weight she can handle with comfort. Most woman from what I have seen shoot in the 40-50 lb range, over 50 might be pushing it. With todays bows and technology she should get plenty of speed from a 40-50 lb bow.
50# minimum for moose, goats, buffalo, and brown bear up here (not that you need it, but that's the law) but that's beside the point...
LET HER PICK HER OWN BOW! I can't emphasize how important that is (hence the caps!) She needs to be vested in her own decision and not have what somebody else wants forced on her. She needs to go shopping and pick the one that fits and feels best to her.