I sometimes joke that I don't know the difference between "hungry" and "bored" when I'm mindlessly snacking; I have a suspicion that Jenn doesn't know the difference between "anxious" and "lazy."
All of the activities that supposedly give her anxiety -- driving in traffic, going to the store, being in crowds, cleaning up after her son, and now paying attention to her own bodily functions -- they're all things that no one particularly enjoys doing. But we all do those things because we're self-sufficient adults!
Her overly controlling yet somehow simultaneously passive husband has enabled this behavior and kept her in a perpetual state of adolescence (even her mannerisms -- the forced laughing at everything, the bug-eyed faces she makes -- are reminiscent of what an awkward middle-school girl would do). It's normal to be nervous about driving... when you first get your learner's permit and don't have a lot of practice. But eventually you get over it because you're a grown-up with responsibilities to take care of. [I can't speak from experience on menstrual cycles, but I suspect that the first few are scary, and then you get used to it.]
What a disgrace that there are now two children who depend on these clowns, and she can't even bother to take care of herself!