This, as others have said, is absurd. First off, the backlog of trivial crap that she's so happy to return to tells me that while John was out of line in implying that she's a glorified temp, that's pretty much what she is. He might be an insensitive dick in saying that she can miss a week or two and the world won't spin out of its orbit but he's a loutish Neanderthal who's making a point. After all, it's very probable that Susan and Monique had someone cover their asses when their kids got sick so Elly can do the same.
Then again, Lynn has a child born after the year 1975 talk like some ass-scratching caveman talking about 'real' moms because she needs a mouthpiece for her ambiguity and self-doubt. Perhaps if Aaron hadn't have made an asinine comment about dealing with his mother for a change instead of a celebrity, she'd vary who that was but his tetchiness doomed Mike to looking stupid.