The article. The snapshot is fairly accurate. She was catching up to the mens' race support vehicles, they stopped her for five minutes. She lost her momentum and her groove, ended up finishing in 74th place.
https://www.cnn.com/2019/03/04/sport/cycling-women-belgium-intl-scli-spt/
And this article says perhaps the entire women's race field was paused, not just the one cyclist in the lead. But anyone who's ever done any sort of distance sport event, you know stopping for 5 minutes can absolutely destroy your performance. A mental and physical disruption.
https://www.cbsnews.com/news/nicole-hanselmann-omloop-het-nieuwsblad-2019-cycling-race-men-belgium/