I don't think she's saying what you think she said. She's making the observation that, based on 10+ years evidence, the Catelyn bashing is a tired subject, and that most (not all -- most) who bash her are doing so from knee-jerk, initial reactions. She's not saying her view is more or less valid.
She could have been a bit happier at the wedding. It's your brother's wedding, cheer up.
Her husband was murdered less than a year earlier. Her youngest sons were murdered a few months earlier. One daughter has been married off against her will to the Imp, of all people, and the other daughter is probably dead in a ditch somewhere. Her eldest son, the hope of his family, has made a disastrous marriage and this wedding is largely a political necessity rather than a long-awaited joy. Her beloved father has died a couple of weeks earlier.
Really, she doesn't have much to be cheerful for. I didn't see much sign of Robb being particularly cheery, either, under the circumstances.
Edited by Ran, 10 March 2012 - 09:53 PM.