The great thing about preteens is that they lack the weight of years' worth of preconceptions. The other great things about preteens is that they learn by playing.
let your preteen play with the cards - lay them out and make up stories with them, act them out, play 'where's waldo' to find the elemental clues hiding in the pictures, read for you, figure out the ways the cards speak to favorite story, TV, movie characters... whatever grabs her interest and sense of fun. When an event or situation or person pops up during the course of the day, playfully ask, 'quick! which card is this?' and let her ramble about the answer, showing how her train of thought on the subject leads to that card.
Share how it's a serious tool, but approach it playfully and with joy. This isn't studying math for a test - it's catching fireflies and making a wish before letting them go.