Is it permissible to name the girls who are invited to discussion sessions to follow up on Dawah?

We understand from the question that the questioner is asking about the ruling on speaking about one of the girls in a way that constitutes backbiting, but with the intention of reform and da'wah (inviting to Islam). The basic principle is that backbiting is forbidden, but scholars have made exceptions for certain cases where backbiting is permissible if there is an overriding benefit, such as the existence of a legitimate purpose that cannot be achieved except through backbiting. This is permissible only to the extent of the need, and it is not permissible to mention the name if the purpose can be achieved without it.