In this instance Paul wanted the church to assist Phoebe in the matters she needed in her ministry. I believe you had said that you didn't see the word deaconess which is simply an extension of the word deacon fitting for a woman. The word servant in the scripture
Rom 16:1, I commend unto you Phebe our sister, which is a
servant of the church which is at Cenchrea. This has the meaning and interpretation of a deacon, and in that position she would have charge over the matters in her charge to my thinking, and Brother Copley brings out the scriptures fitting that conclusion at the following URL link.
http://www.gracegod.com/pamphlet_and_articles/pamphlets/Phoebe.pdf