Sarahi had accidentally driven onto the Ambassador Bridge while en route to Costco, and she was arrested by immigration officials and taken to an office building nearby. According to Ruby Robinson of the Michigan Immigrant Rights Center, Sarahi was being held in a CBP office building next to the Ambassador Bridge, a building that is now being used for detention.
Sarahi says what followed her arrest "felt like a kidnapping." She told NPR that her family was placed in a windowless office space near the bridge. For close to six days, she said they were given no access to a lawyer, told to sleep on cots without proper accommodations for the children (no diapers or appropriate food). She says a few days in, her children began to get sick, and there was no first aid available.
I would not be surprised if Stephen Miller or similar had explicitly ordered CBP to capture children.