As all custody battles are, this sounds painful.
the part i'm going to adress is the last part--the talking ont he phone, because to me it seems liek the rest of the question was there to hide this part, and it's the real one..
SO, i would say, that if he asks to talk to ehr on the phone, and she's there--dont ask her if she wants to--just hand her the phone and say "your dad wants to talk to you" ... dont give her a funny look, dont hold ur hand over the phone and say something else--just say that. NOW, it's compelatly up to her, and if she takes the phone, fine.. if she doesnt--, then she'll prolly say so, and he'll hear it.
if they talk, the world isnt going to end, and if he's REALLY that bad, she'll figure it out for herself. Which is all she needs to be doing right now. Kids arnt stupid, even @ 4 they got more brains than a lot of adults i know.
if she doesnt want to talk, then make sure he hears HER say it, or say why--dont coach her on what to say. That way YOU can tell him, she doesnt want to talk, and there's nothing he can do about it. If you have to, do this every time. Eventually he'll get the clue, or she will.
do your best to leave the door open for HEr to decide what to do... this door may have to be open for 13 more years.

