Mary Bailey was clearly able to take care of herself. She went about armed to deal with ‘blackguards’ and was obviously not afraid of taking them on. Although her gun didn’t go off when she wanted it to, maybe she didn’t have to actually shoot at them too often. Perhaps the sight of an angry woman brandishing a gun was enough to make any scoundrel back off and apologize, so she rarely had to use it. She must have had a pretty good aim though, to try the gun three times and then still hit Samuel Greig in the back of the neck with it while he was running away is quite impressive.
I wonder if Greig learnt his lesson and paid his bills promptly from then on.