All of this strictly my opinion;
The last time his email was accessed at 4:19 pm. I believe she accessed it. Travis possibly went to the bathroom, she hauled butt downstairs, accessed his email. Whatever she saw on that computer, email or otherwise set her off. She made her way back upstairs, and once he was in the shower, after the regular pictures, she pulled the gun. There's a picture of him with his mouth open and face obviously surprised, a little scared it looks like. She held him at gun point and made him sit for the "intense look" picture. He looked terrified. I think the shot came first. She took that picture of him, stood up, hence the accidental bottom of Travis body's picture. She shot him, Travis screamed, her ears were ringing because of the shower enclosure. In the "ninja" story,she said she blacked out once hit in the head. I think she was stunned for a minute due to the blast of the gun. Travis got to his feet, meanwhile she pulled the trigger again and it jammed.
The "linebacker" tackle was travis lunging at her, trying to get the gun. He was able to knock her down toward the toilet area, that's the ceiling picture. She wanted to contain the attack and shooting to the tile so it could be cleaned easily, so she moved further into the bathroom, making the end up near the toilet area.
In the "ninja story," JA says she was resting her head on his back, asking if he was ok. Once Travis was on the ground after lunging at her, he was on all fours. She kneeled, rested on his back, reached around and plunged the knife into his chest. The rush of adrenaline allowed him to stand again, with a roar he threw her off of him, the "body slam." This is the point he most likely mumbled, "kill you b****."
There was a struggle as he moved toward the sink, him trying to get the knife from her.
He made it to the sink to survey the damage, coughing up blood from the bullet that penetrated his sinuses. JA attacked him from behind, clustering knife wounds on his back. I think there was a struggle again as he attempted to take the knife, failing and getting stabbed in the head as he gave up and wanted to just get away.
She probably waited to see if he would just collapse. He made it to the carpet, probably gathering his strength to scream. She slit his throat to silence him and to end his life for sure, since he had fought all the other attacks and was surviving. The camera was kicked around in the struggle. She began to drag him, realized it was difficult.
She stripped the bed, tossing pillows off, possibly tearing the tassels as she flung them off the bed. She used the duvet or sheet to put his body, or part of it, to drag him easier. The palm print happened as she held on to the wall, dragging and pulling. Eventually, she was able to get him in the shower, clean herself over him after rinsing the blood from his body. Her hands were bleeding, but I don't think she noticed much until she gathered the laundry. A roommate said the banister felt slick. She either touched it with bloody hands, or the laundry soaked in blood was rubbing on it as she made her way to the laundry room. I think Napolean (sic) was gated downstairs so he wouldn't interfere in her plans.