Could you give us a Scripture study on Rom. 16: 1-2 which says:
I commend to you our sister Phoebe, a deaconess of the church that you may receive her in the Lord as befits the saints, and help her in whatever she may require from you, for she has been a helper of many and of myself as well.
It is actually quite simple. Deaconesses had 1 duty and that was to baptize women.
At that time, baptisms were ordinarily performed by full immersion, which required that the person who is being baptized to be naked. Now, it would be scandalous and disrespectful to that women to have a male priest baptize a naked woman. It would put that priest in occasion of sin and it would be very uncomfortable for the woman.
Because of this, the church appointed women, who were given the title of deaconesses, to perform these women’s baptisms. Now we know that anyone can perform a baptism, if the situation requires it. (Although the Ordinary Ministers are priests and deacons)
Catechism Paragraph 1256:
The ordinary ministers of Baptism are the bishop and priest and, in the Latin Church, also the deacon.57 In case of necessity, anyone, even a nonbaptized person, with the required intention, can baptizeNT , by using the Trinitarian baptismal formula. The intention required is to will to do what the church does when she baptizes. The Church finds the reason for this possibility in the universal saving will of God and the necessity of Baptism for salvation.
Because anyone could baptize, ordination was not needed. And because women could not be ordained, they could appoint women to do baptisms.
Because of all of these facts, the church appointed these deaconesses. These deaconesses could only perform baptisms, and had no other duty or ability. Over time, as full immersion was not as common, the church stopped appointing deaconesses, since they were not required anymore.
Pretty Simple, Huh?