I watched, I noticed.
Clear top-4 in each heat.
Alexa closed in approx. 65, Elise in 66, both appeared to ease up at end otherwise could have taken 3rds.
2:21/800 first heat, 2:13/800 2nd heat so all time qualifiers from the latter.
Alexa wanted to be near the leaders so, yes, she was running in lane 2 quite a bit.
Elise appeared content to run on the rail in mid-pack until the final lap when she eased into 5th, then 4th, then throttled back near the finish.
Both looked great . . . but so did the 2 Ethiopians, 2 Kenyans and the Polish girl.
For the finals, I can see a 2:10-2:12 opener with a 61 last-lap finish, winner under 4:10 which should be no big deal for the 3:59 girl. Presuming no one gets tripped up, I think it would be remarkable if Alexa or Elise make top-5.
Will make for prime-time TV watching Sunday afternoon