The video seems to be cut near the beginning, probably to remove her story about where she was, so it's hard to know for sure, but it seems very odd that the possibility of robbery/home invasion is never raised, that would be my first assumption when a law professor is shot in his home in Florida. My second assumption would be that he got into an argument with someone unstable that he had some kind of relationship with - girlfriend, drug dealer, student.
Instead she starts talking about someone possibly targetting her children as though she knew it was a targetted killing, I doubt the officer gave that away.