I have my d4 call h everynight before she goes to sleep. It's something we did before the sep since he works nights, and we just kept it up. I think you should do the same. It's not completely going dark, but call and ask to talk to your daughter. Once you end with your daughter, hang up, don't ask to talk to your w. If your wife does get on the phone with you, be professional, and end it FIRST.
Me 36 Husband 35 D5 S2 separated: 10/29/07-present Served divorce papers 1/22/09 "When the world gives out beneath your feet, it is time to learn how to fly."