A minister is a person engaged in carrying out a purpose, the will, etc., of another person; to act as an agent (a person that has the authority to act for or in place of another); to be of service or aid; to be helpful. The Shunammite woman was a minister to Elisha. She was helpful to him by providing with what he needed.
2 Kings 4:10-11 NKJV
“Please, let us make a small upper room on the wall; and let us put a bed for him there, and a table and a chair and a lampstand; so it will be, whenever he comes to us, he can turn in there.’ And it happened one day that he came there, and turned in to the upper room and lay down there.”
The Shunammite woman met Elisha’s needs first, then He met her need (to have a son). She did not ask for her need to be met, nor did she tell Elisha what her need was.
Psalm 100 NKJV
“Make a joyful shout to the Lord, all you lands! Serve the Lord with gladness;
Come before His presence with singing. Know that the Lord, He is God; It is He who has made us, and not we ourselves; We are the people and the sheep of His pasture. Enter into His gates with thanksgiving, And into His courts with praise. Be thankful to Him, and bless His name. For the Lord is good; His mercy is everlasting,
And His truth endures to all generations.”
When we minister to God, He will meet our needs. Like the Shunammite woman we will not have to tell Him everything that we need in order to receive it. God knows our every need, concern and desire, and He is more than able to provide what we have need of.