As a man who adopted a daughter and has dealt with these issues...
She needs to know where she is from.
She has blanks that most people take for granted. She needs to fill them.
Whatever problems her parents had are not hers.
She is made in the image of God.
Picture would be great.
Tell the truth with kindness and thank God for this gift. Give her as many pictures as she wants.
Welcome her. Choose to be loving and kind.
I believe your advice is among the better offered. I
would add the young lady should be told that her father’s
family are generally good people and her dad was not
representative of them. I would not want her to go away
with a bad taste in her mouth about the whole clan. That
would not be the FReeper way.