As to the “behavior” of the 911 operator—-
IMO, the vast majority of calls received by 911 are from people in a state of crisis and panic. The 911 operators are trained to send help immediately, and sometimes they have to be abrupt if the caller is unable to provide the necessary information that could save lives.
No one yet knew that there were no lives to save. At 911, they need to know the location and what is needed—-police, fire, ambulance?
When phones were all landlines the address at least would pop up on the screen, but with cell phones the operator might have to ask, though the girls did provide the address right away.
IMO the operator was slightly brusque and a bit frustrated, but was attempting to discern what was the immediate emergency so she could send appropriate help. They do have to cut through the hysteria, even if it seems cold-hearted, in order to save whom they can.
The presence of a man in the house many hours earlier is of vital, critical importance, of course. But not at that moment of attempting a rescue.
While it’s of extreme consequence that a strange man was in the house at 4 AM, that is for the police investigation and for the trial.
Just my opinion that she had to winnow down the amount of people trying to talk to her so she could send the necessary help, immediately.