Hi D.,
Well, my story kind of relates so maybe it will help...maybe not. I was adopted by my "dad" when I was 2--knew no different until my twin walked in on a conversation my aunt and mom were having after my mom left my "dad". Based on what my twin heard..we were also 7....my mom arranged a meeting with our biological father. We met him I guess a total of two or three times, and then my twin and I decided we did not want anything to do with him. He was an alcoholic and we did not want anything to do with that...yes, at 7 we came to our own conclusions without our mom bashing him or anything. Honestly, having met him and being able to make my own decision on the relationship, I am at peace with him not being in my life. I think if the environment is safe....meet in public, etc. I would go ahead and let her meet him or at least attempt....if he declines then there is nothing you can do, but at least YOU are not the one holding her back from that relationship. Could it be painful for her in its outcome? Sure, but right now she is in pain with unanswered questions and wondering. With the right boundaries and a safe environment, I would do it...for her.
K.