Doctor John: You might be able to answer one of your own questions, anyway. Next time you're out in a bar singing "There's a hole in the bucket" (which is in 3/4, by the way) clap along with yourself, or stamp your foot. Or clap or stamp along with a song someone else is singing. Then ask yourself "How did I know when to clap? What was I hearing that told me where the claps should go?"
If you can answer that question (and you probably won't always hear the same things), that's what your daughter means by "emphasizing" the beat ... it's hard to get a straight answer because it's a lot harder to describe than it is to do it or hear it.