Also, just so she understands, red eyed tree frogs are very shy, they do not like to be handled at all, and they love to hide. So when you build the vivarium, make sure you include a lot of hiding places. I know that isn't "fun" but that is what will make the frogs healthy and happy. They are also nocturnal. This is a pet that could get very boring for an 11 year old, but if she's dedicated to their proper care without handling them, and understands that they like to hide and sleep during the day, then she will do a good job.