The cops' radio mentioning of the kids was at 2:12. Mangum was at Durham Access by then where she was to be committed. When she learned that, she probably came up with the kids as her first excuse/reason to not be committed - the kids need her. The cops would have responded with "Where are they?" She would have said where they are. Then they would have said, "We'll send someone to check on them." So then Mnagum goes onto her next excuse - "I was raped." So at 2:37 she's on her way to Duke and they're going to bring in a SANE nurse.
It's pretty obvious what went down by the timing and content of what was said. We don't have all the details yet of everything that was said from the time the cops arrived Kroger's until they wrapped it up a couple hours later, but the sense of it is pretty clear.
Wouldn't the cops wonder why the kids wouldn't be safe at their grandparent's houes?
What would the police say to the Mangums about the reason for their middle of the night visit?