momager
n. A mother who manages the career of one or more of her children; a manager who performs the duties of a mother.
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Etymology
Examples
2015
Kris Jenner is owning her reputation as a momager — literally.

The Keeping Up with the Kardashians matriarch has just filed legal documents to trademark the word “momager” and embracing a nickname that has stuck ever since her family’s rise to fame, she confirmed to PEOPLE.
—Kathy Ehrich Dowd, “Kris Jenner Wants to Trademark the Word ‘Momager’,” Time, May 26, 2015
2014
It's funny how the publicist always gets turned into band mom, or, more aptly, the momager.
—Jessica Hopper, “How to avoid being the 'momager',” LA Weekly, April 08, 2014
2013
Another insider said having to deal with Heigl's momager is what could lead to the demise of an otherwise talented actress' career.
—Chiderah Monde, “Katherine Heigl slammed as ‘difficult,’ ‘not worth it’ by Hollywood execs,” New York Daily News, September 12, 2013
1993 (earliest)
In Hollywood, five dynamic Black women have carved out successful niches as mothers who actually manage the careers of their offspring in the highly competitive, ofttimes disappointing world of entertainment. Of these, Dolores Robinson is the only "momager," as her daughter calls her, who has clients other than an offspring.
—Lynn Norment, “Manager Moms,” Ebony, March 01, 1993