It’s currently unclear how much Grindelwald was targeting Queenie specifically, but her psychic abilities will no doubt be of interest in Fantastic Beasts 3.
Johnny Depp’s villain also used terrifying images of World War II to scare the Wizarding Community, convincing others to join his cause.
It’s this outsider identity that Grindelwald was able to tap into, and convince Queenie to leave the Ministry and her family for another cause.