Don't let your husband know how it bothers you. Actually your best bet would be to make friends with her and be sickly sweet about it all.

He's going to feel extra-guilty if you aren't even being a bitch about it.

I recommend reading "Charlotte Simmons" even though it is a crappy novel, just for the portion where it discusses "Sarc 3"...

Sarc 1: real sarcasm.
Sarc 2: sarcasm with a hint of sincerity (confusing)
Sarc 3: being SO NICE that nobody knows you're being sarcastic.

I say take Sarc 3 with this bitch. And don't breathe a word to your husband, either.