A.B.
Just set some puffs in front of her, and then let her go at it. Don't give in and start feeding them to her. Maybe do it at a time where she isn't really hungry, but she'll snack, that way she doesn't get too frustrated. Sometimes you just have to step back and let them learn things on their own. She knows they're food, and she'll want to get them in her mouth, so she'll figure it out!