Your phone, your choice as to whom you accept calls from - no problem with that.
That you can control but I do agree with Marle; if he is going to stay out of her life, SHE is the one who has to make that decision. As a mom, I have been guilty of trying to protect my AD from herself and those who would hurt her or influence her in the wrong direction. BUT... it is not our decision to make, unfortunately.
Tell her he called or not, yes, that is your decision; again, it's your phone;your home. It's wonderful that you two are spending so much time together and hopefully, when she is no longer with you but ventures on her own, it may help. But realize that it truly is SHE who has to make her way to her own destination with whomever she chooses. Pray she chooses wisely.
Hugs from another mom.