Yep. Frankly I don't think anyone should go to failure, even in the lower rep range. I think it's over-rated. I have always held the belief that you should never get yourself into such a position that you cannot handle a weight safely and using proper form and in theory that's exactly where you are when you go to failure (this is training philosophy, mind you, not competition, but in a competition you are forced to assume the spotters know what they're doing).
Think three sets of 10 reps to get her started. It builds muscular endurance as well as strength. By the time she does the last set of reps she should be virtually to the point where the muscle is exhausted, but a brief rest will bring it back pretty quick.