I am inclined to agree with her. God works through people, and if she and her staff helped you, as you clearly imply in your letter, you can take the help as from the Lord and thank Him.
In response to King Hezekiah’s mournful prayer when he was told that he was dying, God granted him fifteen more years of life. The king would recover, but only through the ministrations of a prophet sent by God. The prophet Isaiah ordered that a poultice of figs be applied to Hezekiah’s nearly fatal boil, and Hezekiah recovered. Obviously, the Lord stopped the king’s lurching toward death. But He didn’t just say “Get well!” He sent Isaiah with a few figs for medical intervention (Isa. 38:21–22).