What an objectively stupid way to die. First off holsters are always strapped down so random people don’t grab the gun (like what happened), second of the gun wouldn’t have been cocked (it’s a revolver) or even if it was there wouldn’t be a round in the first position giving at least a second for the police officer to tackle her, third off the moment somebody even tried to go for an officers gun they would be tackled to the ground, fourth off when someone is arrested for a serious crime they would be handcuffed with their arms behind their back and as they get escorted to the police car two police men would have holding each of her arms.
If you wanted mc to die at least let it happen realistically.