I used to work for a TV station and the anchors would talk about all kinds of shit when they had their mics off. Some were primadonnas but most of them were making crude jokes and remarks about any number of things.
My guess is that the cameraman had the hacked up body of the anchor's mother and was using it like a ventriloquist's puppet to mock the anchor and it was causing her to giggle like a schoolgirl. That's the kind of shit that they would do.