She doesn't have a good track record.
As one of the architects of Detroit’s charter school system, she [DeVos] is partly responsible for what even charter advocates acknowledge is the biggest school reform disaster in the country. At least some of the other candidates for education secretary, like Michelle Rhee, the former District of Columbia schools chancellor, led reforms that were accompanied by improved student results.
Consider this: Detroit is one of many cities in the country that participates in an objective and rigorous test of student academic skills, called the National Assessment of Educational Progress. The other cities participating in the urban version of this test, including Baltimore, Cleveland and Memphis, are l widely considered to be among the lowest-performing school districts in the country.
Detroit is not only the lowest in this group of lowest-performing districts on the math and reading scores, it is the lowest by far. One well-regarded study found that Detroit’s charter schools performed at about the same dismal level as its traditional public schools. The situation is so bad that national philanthropists interested in school reform refuse to work in Detroit. As someone who has studied the city’s schools and used to work there, I am saddened by all this.
[source : Betsy DeVos and the Wrong Way to Fix Schools, New York Times, http://www.nytimes.com/2016/11/25/opinion/betsy-devos-and-the-wrong-way-to-fix-schools.html?action=click&pgtype=Homepage&clickSource=story-heading&module=opinion-c-col-right-region®ion=opinion-c-col-right-region&WT.nav=opinion-c-col-right-region, 25th November 2016]
So it looks like Trump picked DeVos for reasons other than her success in implementing an education system.
So what were those reasons?
Corruption (her brother donated yuuugley to a pro-Trump PAC)?
He wants to grab her you-know-what?
All of the above?