Hasay was visually annoyed/angry at Rowbury after the race and only put on a fake smile when Shannon was right in front of her face.
From Rowbury's interview it was clear that she was meant to share in the duties of setting the pace near the end, but she didn't citing "Hasay pushed the pace every time I tried." She never tried to go to the front once.
Sure, this is a race, and the first one across the line wins, but it is a low move to have a strategy decided with your teammate and not follow through. Even worse to kick past that teammate at the end then.
I think you are reading in a lot of things that are not there. Hasay obviously was trying to hold off Rowbury the last two laps. Rowbury is a true middle distance runner and Hasay is a true distance runner. Hasay probably will be the US's next great female marathoner. Rowbury probably will never run a competitive marathon. Hasay never will beat Rowbury at anything shorter than 5k and it probably will be a couple of more years before Hasay can have a shot at beating Rowbury at 5k.