That's a great summary of Jodi Arias' actions indicating premeditation. And I do believe the catalyst for this was Travis Alexander calling her out as a liar and sociopath.
He was done with her. She planned everything to leave no "footprint" in Arizona, and her meeting with Ryan Burns was simply an alibi to put her closer to that goal.
For that reason I wonder:
1. If Travis Alexander had any idea she was coming. That they talked on the phone tells us nothing of the conversation.
2. That she entered the home at 4:00 AM. She may have arrived in Mesa at that time, but why go through the elaborate preparations if they could be done by a roommate spotting her in the home?
From the photo time stamps the earliest she can be placed in the home is 1:44 in the afternoon. Do we know if any of the roommates were in the home at that time or had they left earlier? If she appeared in the downstairs computer room first and hung out with Travis watching YouTube videos, wouldn't that put her at great risk to be spotted by a roommate?
Depending on the movements of the roommates, I can see her sitting outside his house, in her inconspicuous white car with her now brown hair, watching who entered and left.
Which, if true, would add not only premeditation, but lying in wait to Jodi Arias' list of stellar achievements.
And it adds another rational for carrying the .25: Pesky unavoidable witnesses.