I also grow tomatillos. Ground cherries and tomatillos look very similar, but not the same. Ground cherry is considered a fruit, while tomatillo is considered a vegetable (they taste very different). I had to look them up in UK. I saw seed catalogs in UK selling seeds of both ground cherry and tomatillo, so they are definitely different. The growth habits of these two plants are also different. Ground cherry will stay low to the ground while tomatillo tend to grow several feet tall.

If you are not growing ground cherries, you should definitely look into growing some. Your little girl would love it!