I was adopted in a closed adoption like so many of us 40 year olds. But, I do have some insight on the adopted parents end in open adoptions.
John, one of my best friends and his wife couldn't have any children so they adopted. Being an adoptee, I was at first opposed when they told me that they were going to have open adoptions. They now have 3 adopted children all through open adoptions and I have found myself in support of open adoption.
They regularly hear from the bmother of 2 of their kids and even visit them as vacations. The birth mother of their middle girl never writes or calls even though she knows where they live and has their phone number. John told me that she cried because her birth mom never calls or sends cards like the birth mothers of the other children get.
I know that if john and his wife could talk to the middle daughters birth mother, they would beg and plead for her to call to talk to their daughter. You have an open door that a lot of bparents and adoptees never get to enjoy.
I applaud you for your strength
Someday your daughter may know the circumstances of her conception but I don't think that it will matter to her. It might cause some angst as part of the whole teenage drama scene, but in the end it will probably not matter.