S.L.
I've read a lot about what to tell an adopted child when you dont have a lot of info. Let her know its OK to wonder what he is like, tell her what little is know -color of his eyes? hair? does she have his smile or his singing voice? If nothing else you can speculate... if her eyes or artistic talent or athletic ability do not reflect her mother you can say maybe you get that from him. But continue to reinforce her family are the people who love her and care for her and celebrate birthdays etc with her, Mom and G pop and Auntie and Uncle and maybe you? That the reason he is not in her life is not because of her but because he wasn't ready to be a father or ....?