The behavior of the child's father should not keep her from her grandparents. Children have the right to family, especially their grandparents. If you do not know the step-grandmother, it does not seem reasonable for you to turn the child over to her, but it would be nice if you could arrange a visit where you would be present. Given that this person is a step-grandmother and has to date had no contact with the child, it is unlikely that a court will grant visitation. On the other hand, the reasons that she has not ever seen the child, the age of the child, and other considerations may come into play. Regardless, the court will want to do what is best for the child.