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Probably. Here's an article from 2 years ago
https://www.cyclingnews.com/news/van-vleuten-reveals-massive-year-end-training-tally/
She would join the Michelton-Scott men's team on their training camps which you could see in some of their vlogs/YouTube series and there's less info but it seems she also joined some at Movistar
https://www.velonews.com/news/road/annemiek-van-vleuten-starts-new-chapter-at-team-movistar-training-camp/ -
She has a reputation for being able to train harder than her teammates, and as @Sumo highlighted, regularly trains with men's side of the team.
Women's racing tends to avoid the longer, harder climbs as the disparities between full time, well funded pros like Van Vleuten, and part-time, barely paid a living wage 'pros' in some of the smaller teams is stark.
Rouleur with some choice quotes
https://www.rouleur.cc/blogs/the-rouleur-journal/it-s-not-normal-what-she-did-what-does-van-vleuten-s-performance-at-the-tour-de-france-femmes-mean-for-women-s-cycling