Kira was highly confused because of the once peacefully undead being disturbed from their eternal resting places below ground, not being fearful of them for she was foretold of this because of because of being a time traveler.  She foresaw things that happened in the future. 

She saw with her crystal clear vision as the water tower's base was being bombarded by what looked like thousand upon thousands of the undead, deciding whether to fight with the masked man or retreat and find shelter and live to fight aother day.  She chose shelter above suffering and dying a slow demise at the teeth of the zombies. "I apologize for not warning you before I shot, Jack." She sincerely apologized.

She said softly, keeping her weapons armed in her hands but following her friend. and heading back inside is an idea I agree with." She ran inside of the Saloon, never letting go or sheathing the guns, as far as she was concerned they were her new hands. She also grabbed the same brand of botte of whiskey but a different bottle, chugging down half of it before keeping it close by as she shattered a part of a window and took her part of the station. She aimed her pistol barrel of her guns at approaching zombies. She got up to higher ground, hoping that no towns folk would be consumed by the carniverous, brain-eating zombies. She was a predator in her own right but she never killed anyone like the zombies. 

Never.  She wanted to be with Jack and make it out of this and not be torn apart by the brain consumers. She was stuck between two emotions, one was glad because she and JacK finally cracked the code but dread because she saw the dead rise oNce more.