There's no magical technique, but you should still be able to discuss it with her --- maybe bnot by asking directly, but talking about how you feel about the plans to move, and asking how she fels about aspects of it. Talking about what she thinks it will be like in the new place, new school, the chance to make good friends --- not sales talk, trying to convince her it'll all be dandy, but interested in how she see things. She will express her feelings most freelly, perhaps, when not asking and talking specifically about feelings as such. And watch aspects like her appetite, and sleep, and ability to concentrate.