From what little I know about her, I would ASSuMe she and hubby are following their beliefs. A wife is to be submissive to her husband,
BUT the husband is also to love the wife, as God loves the church. (Not exact biblical quote.)
Soooo, assuming her hubby loves, cherishes, appreciates, respects, etc. her...it is probably pretty easy for her to be submissive to him. A LOVING hubby, being the "head" of the household, doesn't mean that the wife is a door mat.
As far as the amount of children...
no thanks. But that is just me. They financially support all of them. They aren't freeloaders of the "system." They all seem very happy, well adjusted, loved, and loving. I'd say they are doing something right...something that works for them.
PS I would have to read/hear exactly what she said to whom, and under what circumstances... to decide if her advice was stinky. Reporters tend to quote words out of context.