Considering your dog's age I would continue to use the crate, but I would give her something to do...like finish a frozen stuffed Kong. Nothing makes for a doggy pacifier like a well packed Kong. However, I'd ask your puppy-instructor if a placement cue, to a mat, will be a part of your schooling or if this behavior will be taught in subsequent courses. Because I think this is what you actually want, your dog calmly settling down on a mat at dinner time.