[4] At Abbott Village Mission School, she taught the primary class and played the cabinet organ.

The stained-glass window in the front of the Williston Church in Portland, Maine is a memorial to the Mizpah Circle.

Under Clark's leadership, the Mizpah Circle also raised money for the "Book of Psalms", which was used in the responsive service of the church.

These responsive readings were found one Sunday morning in the pews as a symbol of youthful contribution to the worship.

[3] Clark, an effective speaker, is credited with having originated the Christian Endeavor idea, and the movement's success was largely due to her.

A constant sufferer from seasickness, she probably traveled more miles by water than any other woman from the U.S., earning the title, "Mother Endeavor Clark".

She traveled not only by steamship and railway but also thousands of miles by carriage and bullock cart, on the back of horses, mules, donkeys, camels, and elephants, in sedan chairs, rickshaws, wheelbarrows, and on foot, to keep their Christian Endeavor appointments in the out-of-the-way places of the world.