I wonder if this mom is making those choices because she really feels like they're right, or because it makes her feel good to say she's "different". C'mon we've all met those moms, right?
"I breastfed Johnny until he was 4.... (so clearly I am a better mother than you)" or "Really, you use regular pasta noodles? I ONLY use whole-grain-organic-ethically-farmed-gently-harvested-air-noodles. They're SO much better for you.... (and I am SO much better THAN you)"
It's one thing to do it because it's the right choice for you and your family. It's another completely to alienate everyone around her (and now her daughter, so sad) in order to, essentially, prove a point.
I hope she realizes that if she grows up attempting to make all her children's decisions for them, one day it will bite her in the backside. The best we can do as parents is teach them what we hope they will choose, and then let the birdies fly!!
*sigh* Hope your daughter is able to play with her friend again, sometime soon!