As a newbie to this site I'd like to thank everyone for their contributions. There is so much insight, knowledge and information on WebSleuths.com. My view is that Travis did not know she was coming. She couldn't risk him telling anyone, by email, text or in person. Travis had raised concerns about her to others even if he later chose not to mention her to friends like Chris and Sky Hughes. To have risked any mention would have potentially damaged her premeditated efforts.
Arias calls to Travis from the road were brief. She may have reached him and ascertained whether he was alone. I suspect she turned up to give him the tape of the phone recording or offer compromising photos and a video of her as a tool for Travis to counteract any blackmail threats. Arias could then delete any such evidence after killing him. Maybe she just used the cheque (check) as an excuse to drop in?
I'm not convinced she revealed herself to Travis when she said she did. Her interviews reflect hesitation when questioned on house arrival time. I agree with the posters mentioning the dog not barking being odd. I suspect she waited until a roommate left around 6.00am. How much longer after that?
It seems to me that Travis willingly had sex with Arias. She probably promoted it as one last romp - with photos for him to keep. Cancun and possible marriage to a 'good girl' like Mimi Hall became the final straw.
One thing I struggle to reconcile is the shower photo sequence. None of it looks relaxed, fun, easy. The haunting shot of Travis gazing into the camera with a look of confusion and fear is another discordant note in Arias' version. There seems more to this. Arias didn't seek to tell him what she thought of him? Remember how she repeatedly indicated how she would stop if someone pointed a gun at her? Given how much she loves to talk and how she resented Travis for not allowing her free expression of anger, this makes little sense. Maybe she ran out of time but something nags me that Arias would have wanted to exert some control over Travis before brutally slaughtering him. Is it possible that she made him pose for the shower photos?