To those jumping straight to conclusions that she is doping. There is not much grounds to go off. She has steadily been improving in one way or another every year, staying injury free and has now made it to the world beater level. She is only a couple years out of college and has the perfect middle distance body and form. I've been noticing her in races since 2014 and she has always been able to switch gears and kick like crazy, now she is just able to do it against the worlds best.
I think it's unusual that she ran this fast WITH that kick. To be able to have that much drop in time and have that kick at the end is insane. Most people develop the times and the kick in different years.
In her defense, I think she's been in 3:59-4:01 shape the past 2 years even though her PR had been 4:03 til this season. Maybe it was just her concentrating on 5k training or Jerry was peaking her in a manner that never lined up for a fast 1500 while she was in peak shape. Maybe there was a set up, but she had an off day. Too many variables to justify the time, but that kick is unreal.