Would have to disagree. Although yes there is currently light years (2.5ish seconds) between her time and the womans world record she is only 18-19. Again take Michael Johnson as an example. When he was 20 his best 400 was 46.27s. He went on to run 43.18 to break the world record when he was 32. Obviously a lot definitely has to go in her favor - e.g no major career ending injuries and to remain motivated etc but she could definitely achieve it.