You are right in cautioning your W's gf about not pushing too hard. What I've learned is WW only want people around that approve of the A, or at the least not bothering her about it. WW will get new friends if necessary to not have to confront their own conscience and spoil the fun. My W's bff is a serial cheater who got that way after one of her friends showed her the way. And this BFF was showing my W the way to WW until I stepped in and stopped the chain of WWs. That's why I am very uncomfortable if my W has any D'ed friends (she has none now and her BFF is gone for good). It's like a contagious virus when you get too close.
Me:49 W:45 M:19 T:22 EA confirmed and ended 8/2014 S:19,17 D:9,5