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.