Other, of course. I would expect her to be in a "safe room" with the kids long before the intruder could get to her. For those not familiar with the "safe room" concept, it's pretty simple. You designate a room as a safe room. Anytime the house is broken into, she would go to such room which is stocked with a gun (large enough in caliber to penetrate the door and anyone on the other side of it), a cell phone and a decent lock/bar system on the door. When the burglar alarm wakes her, she and the kids go to such a room, lock themselves in, call the cops and if necessary, blow away anyone who she doesn't know who tries to enter the room. The smallest child's room or closet would probably be the best choice, older children would know to go there when the alarm goes off. Other useful items to have at hand would ear defenders in case your local area doesn't allow suppressors or if one of us doesn't have the appropriate license for one, Water, a few snacks and any items necessary for infant care. If anyone but the husband, whom she knows, or the cops, which their presence and even the dispatched officers name/badge number can be received through the 911 operator (or should be, if not, you need to vote to improve your 911 system) attempts to enter the room, she starts plugging rounds through the door.
There are lots of different options/systems available for entryway/window alarms, motion sensors, etc. Also, having a good dog in the house is a very good investment to warn you before an assailant can even enter the house.
Outside the house, concealed guns, knifes and other sharp pointy objects are always good to have on your person. When able, having a good loving dog of sufficient size to cause injury to an attacker as a companion is always a good thing.
I am currently unmarried, but any woman I might even possibly consider marrying would definitely have to be pro-gun. I currently sleep with a loaded semi-automatic .44 magnum on the bed or in easy reach (8 240 gr, hollow points loaded and two spare magazines, 8 round each, the gun is kept loaded with one in the chamber and cocked and locked). Long before we ever got married, she would either support that, possibly even have a gun already herself, or she would never reach the stage of being my wife. At least one date during the courting phase will be to a gun range.