Here is Arias admitting all those pictures (found) were originally on her camera.
(start at 8:00)
http://youtu.be/6k29w7HjsVM?t=8m53s
I think this is quite significant and I wish my original post (to this) wasn't deleted!
Arias was not there earlier in that day therefore, Travis did not let her in. She put those earlier photos-- of her in braids and Travis with KY-jelly (from April) on his camera from her camera.
She most likely did this after she sneaked through the back window (screen evidence #52) which happened to be his office window where his camera was located. He was probably sleeping because he told his roommate via phone that morning, he had been up all night.
I have little doubt that Arias sneaked up to Travis while in the shower and that was the beginning of the end.
There is no way that I will EVER think Travis invited her in that day. No way!