From the MinnPost article:

Most child care centers are locked and have obscured doors or windows for children’s safety. Children are also kept in classrooms and would not likely be visible from a reception area. One of the day cares in the video told several news outlets that it did not grant Shirley entrance because he showed up with a handful of masked men, which raised suspicions that the men were agents with Immigration and Customs Enforcement. At least one of the centers was closed at the time Shirley arrived because it opens later in the day to serve the children of second-shift workers.

Is there a history of child care fraud in the state?

Yes, but it’s not as widespread as Shirley claims.