Next time she says you're jealous, afar, I suggest you tell her that that's what makes you a good mother. Mothers throughout the animal kingdom are fiercely protective of their young offspring and often object to interference from others. It's a survival strategy. She's calling it by the wrong name because, as jess suggests, it's probably she who is jealous.
In short, you're allowed to be "jealous" (figuratively kick the butts) of other women trying to control your child. It's normal.