We should facilitate the opportunities (of Da’wah) for the Female Callers to Allaah (subhaanahu wa ta’aala) and I do not know of anything that should prevent this. Whenever there is a woman present who is qualified to give Da’wah to Allaah (subhaanahu), she should be aided and it should be requested of her to direct and provide guidance to women because they are in need of female advisors and guiders of their own kind.
The presence of a female caller amongst women may be more beneficial in conveying the Da’wah to the path of the truth (to them) than a man. A woman maybe too shy to tell a man about the issues that concern her, or there may be something that prevents her from listening to the Da’wah from a man, but this is not the case when she is with a Female Caller because she mixes with her, relates to her what she is concerned with and she is also affected by a female caller more (than a man).
Therefore, it is imperative upon those who have knowledge from amongst the women to perform what is Waajib (compulsory) upon them in relation to Da’wah and directing (other women) to everything that is good according to the best of their abilities, as Allaah (‘azz wa Jall) says, {Invite/call (mankind, O Muhammad ) to the Way of your Lord (i.e. Islaam) with wisdom (i.e. with the Divine Inspiration and the Quraan) and fair preaching, and argue with them in a way that is better.} (An Nahl: 175)
He also says, {Say (O Muhammad ): "This is my way; I invite/call to Allaah (i.e. to the Oneness of Allaah - Islaamic Monotheism) with sure knowledge, I and whosoever follows me..} (Yusuf: 108)
He says as well, {And who is better in speech than he who invites/calls to Allaah (Islaamic Monotheism), and does righteous deeds, and says: "I am one of the Muslims.} (Fussilat: 33)
And His saying, {So keep your duty to Allaah and fear Him as much as you can…} (At Taghaabun: 16)
The verses of this meaning are plentiful and they are general to both men and women and Allaah is the granter of success.
Reference: Majmoo’ Fataawa Ibn Baaz: Vol: 7/P: 325-326.