you said pepper spray can have little to no effect or kill someone, well, so can a punch. but I'm sure the pepper spray will have much less chances of killing her than the free punch.

and please tell me how was she keep restraining him if there's a gun pointed at her?

Police officers don't use guns as detterents. They use it to shoot people.

Officers are trained to only draw their weapon if there is immediate danger, not because they want to intimidate someone into backing down. Not just because it's dangerous, but because it escalates the situation. At that point, the only alternative the police offer has is to holster his gun or fire.

In the end, getting in the way of a police officer trying to do his job should not be tolerated. She had no right to interfere the way she did, and she was brought up on charges and convicted for doing exactly that. The officer, meanwhile, was cleared, and is back on active duty.