Living on her own (vs. brother's) with an infant will be a huge wake up call for her, no matter what happens. You won't be able to completely detach due to the baby, but I at least hope you detach as much as you can.
I agree with not spending too much time in her new space. I told our C the same thing last night. W and I agreed to at least one date night a week (her idea even!), but she fears that I'll use flimsy excuses to stop by too often. I don't want to, it would make it that much harder to detach.
Me 43 W 38 M 5 T 7 SD20 S15, S13 with 1st W ILYBNILWY June 2010 Separation/Bomb July 2010 Divorce Feb 8, 2011