Dear Mom,
Your baby is now a grown woman, come to terms with this. She is now making her own choices, and she needs to take the consequences for her actions. Ask her straight out if she has been to family planning? And if not, why not? Does she understand the reality of making love / having sex makes babies? Has she visited another girl who didn't use protection and now has a child and her life as she knew it is now gone? Is she ready to give up her exciting life to tend and care for a 24 a day needy little person. Be very blunt! Make sure she knows you will not be in the picture if she has a child, it is hers, and you will not raise it. You have your own life to live, and you are looking forward to it, obviously. Don't put guilt/she is hurting herself in the picture, only cold hard reality and responsibility. Guilt comes out later in so many nasty ways, including back lash at you. Maybe you need to go talk to Family Planning separately to get some perspective on your girls life. Keep the talk channel open, it is established and needs to be shored up by woman to woman perspectives. She will take on an entirely different attitude.
When you speak of her father, you say, "father left us", he is not your father, it makes you sound helpless, you do not need to give him power over your actions, you need to jump in to your new life with gusto. Get some counseling about this, it will clear the air, you will feel better.
And the trust issue, "I just don't know where all the trust went", it is still there, but life is progressive not static, you need to become the change you wish to see. You cannot change your daughter, she also is making adjustments and changes in her life, stand back out of the way, the sooner she feels in control, the better off for both of you.
E. H