[Steeltrap]

This thread is ROFL, especially the "ghetto bunnies" comment.
Straight take, however: Pulling the woman aside, or taking her to lunch probably is the best idea for tackling the situation. That's because you can get her one-on-one outside the office. When you talk, try to make her understand that she can do whatever she feels like on her personal time but that she's got to straighten it up and be about business on work time.
You hope she would appreciate your efforts. Bottom line, she's got a son and must be self-sufficient.