Now, don't get me wrong; she's probably got the Pattersons fairly well sized up in every other respect. She clearly sees that John is a self-satisfied oaf, Elly a passive-aggressive jerkwad, Mike an entitled dumbass, Liz a photostat of her mother and April the family unfavorite. What she doesn't seem to have picked up on is that they regard her as being a manipulative tyrant who wants to use her family politics to control them and make them her slaves. All she seems to see is a clannish bunch of idiots who treat her shabbily because they're still sore about the wedding.
She's, of course, not alone in not having any idea that she's seen as a monster by the Patterson family; as I have said so many times before, Becky hasn't the blindest idea that April and her family live in fear of her because they're convinced that she'll use her star power to crush them into nothing and laugh doing it. She does see a former friend copping an attitude because she left her silly garage band but remains ignorant of the fact that she's regarded as a threat.
The exception that tests this rule of thumb is, of course, Thérèse; she does know that the Pattersons regard her as the second coming of Lucrezia Borgia and has a fair idea of why. The "why", of course, is that she happened to suffer the misfortune of falling hard for a man who came from a small town stocked with small-minded, clannish idiots who didn't like her because she represented not only an outside world they hated but the destruction of their dream of pairing her husband off with some pallid little nonentity who had nothing to contribute to the world aside from passive-aggressive shrieking. She simply sees the Pattersons as being the rabble most closely related to the screaming dunce who wanted to keep a man she thought had potential from achieving it.