I'm so sorry, I know the sting and it blows.
Just take it one day at a time and if that's too much, one hour at a time until it becomes bearable. It's ok to feel and grieve.
The thing I've learned is that no one can hide behind a facade for too long.
She may seem like a Debbie do-gooder to everyone now, but as soon as they start flaunting it, the truth will come out.
Eta: I'm sure more people pass negative judgements on them than you realize. I can't begin to tell you how often I've seen OW become a scapegoat and fodder for the gossip mill at work (I'm a corporate type).
Just because you aren't hearing about it doesn't mean it isn't happening. I mentioned in a post earlier I've noticed a lot of slut shaming of known OW in the office. It's always the first thing you hear about someone. It's just not acceptable to most people even if they don't freely express their opinions.