Ok, this is really bothering me, the window.
OP says he heard intruders, window was open, so the intruders came through the window.
Why, and I cant find a plausible reason, did Reeva open that window.
We know it was hot and stuffy in the bedroom, they had balcony doors open and fans on, so the windows itself would not be enough to circulate air around the room, the fans were needed as well.
The window is in the bathroom, which is down and around the corner of the corridor, so opening that window would have absolutely no effect whatsoever on the bedroom. She was in the toilet with the door shut, so again the open window would have no effect on there.
You could say the would have stood in front of the window, why? she got out of bed whilst OP was turning off the fans, bringing them in etc... so she had not come out of a stuffy room? So she couldnt have been lying there getting so hot she needed to go into the bathroom to get air. It just doesnt make sense, unless the window was already open and she had not opened it maybe?