She signs up for every committee, offers to bake for every bake sale, and always falls through . . . each and every time. Her halfhearted participation means that the slacker mom is putting more work on everyone else, and she doesn't have a clue she's doing it.
How to Handle Her: Give her a gentle reminder the day before the obligation that she's signed up for. A friendly call, text, or email takes just a minute and will hold her accountable, saving you the frustration of having to compensate for her shortcomings.