I prosecuted sex crimes for nearly ten years. Camille Cosby's behavior & response is actually the norm: denial. I had families where kids went into foster care because mom wouldn't admit the truth that dad or boyfriend had been raping her daughter.
It was actually uncommon (and a miracle when it happened) for a mom to side and protect her child.
I think the offender knows what partner they are picking well before the crime. So while I don't condone her public comments, I am frankly not surprised.
Confident, self assured, mentally healthy women don't have decades long marriages to rapists. It just doesn't happen. I think that may be the point the media and public is missing.