Meg,
I personally don't think you are asking too much to expect your true friends to be sensitive to what is going on in your life right now.
I think JT said it best. Your life is taking a new direction and 'partying' friends just don't seem to be your cup of tea right now, if ever. And yeah, we'd sure like it if everyone could do the right thing and consider other people's situations, but it's a sad fact that they don't.
I often think about what a real shame it is that the American public is so uneducated when it comes to the world of addiction and how it not only affects the addicted but the family of the addicted also. I swear, if I could go on a campaign to educate the world, I would (not that I'm an expert, but you know what I mean.)
Meg, I say choose the friends who make you comfortable. And it doesn't sound like Sharon and Wendy are those friends right now.
It's called working your program, gal. Do what is best for you!
(Listen to me? Like I'm the queen of working my program?...lol )