A long gun might be a better option, but if that is off the table then it seems to me that in a bedroom/home defense situation, it is unlikely that racking the slide is going to come into play. Grab a pistol with a round already in chamber and fire away. If 10/12/15/17 shots doesn't resolve the situation, I doubt another mag is going to help. It is possible that the shooter might need to clear a malfunction, but unless the malfunction occurs in the first 5 shots, she is still ahead of the game with a pistol, and it is a much easier trigger pull.
If at the range if she can't rack the slide on a pistol, take someone along who can. My $.02, consider the source!
