SML can run 200m faster than her 22.39 pb, but 22.66 for opening 200m of 400m is still too close to her redline. If she does that again, she'll be banging her head against a wall.
She looked visibly nervous at the start, understandably so. The lesson she should learn is to dial it back and not try to win the race in the first 150 meters.
Yes, Koch did go out very fast in her WR, but it's a mistake to get hung up on that race in particular as "world record pace" for SML.
Michael Johnson set a 400m WR with two splits of 21.xx. SML would lose nothing by going out in 23.5, instead of 22.6.
And it would be a lot more pleasant than banging head against wall.