Sadie Engelhardt ran a solo 2:05.66, winning by 6 seconds.
At Engelhardt's current age, Athing Mu's pr was 2:06.88, in a race she won by 16 seconds!
Obviously Mu has WAY more raw speed, so point here isn't that Sadie will eclipse Mu in the 800. That's not gonna happen. But with PRs in the 1600/3200/3mi-xc (most common distances in CA where she runs majority of races) of 4:34/10:00/15:59 and now a 2:05 800 it's safe to say she still has a lot of upside in the distance events.
Engelhardt doesn't have quite the graceful stride of Mu (who other than Rudisha does though?) but it's very clean.
Can't really bet on freshman girls' future success for reasons I think most of us understand and don't need to talk about, but if I had to...