Why does Jim’s grandmother decide to find work for Ántonia with their town neighbors, the Harlings?

From the text:

In August the Harlings’ Danish cook had to leave them. Grandmother entreated them to try Ántonia. She cornered Ambrosch the next time he came to town, and pointed out to him that any connection with Christian Harling would strengthen his credit and be of advantage to him.

Grandmother also wished to get Antonia out of hard field labor and back into a more domestic atmosphere.