Do you have only one purse you carry yours in? She likes to have a different purse for every day of the week it seems.
I would just hate to see her set it down and it get swiped, plus the purse is off the body but, since others do purse carry maybe I'm over thinking it. I know if she would be in a situation she has no means to really fight. She does have pepper spray that is on her key chain that she has in her hand whenever she is going out to her car just so its there. She has found a couple guns that she is comfortable with.
I can put it in every purse I own. I have a pocket holster so I can put it in any pocket of the purse. I have never had a problem concealing it. If you are worried about her sitting it down. She may want a pocket holster or hip holster. The only problem I have using my pocket holster is that my pockets are so small so I can only use it with like half my wardrobe but if she had a hip holster you wouldn't have to worry about it not fitting or her sitting it down.