Wow, I don't understand how someone can think anything can live in something it can barely move in. If it wasn't meant to move at all, or much if any, it's probably not going to be something living.
It's not that hard to get them something bigger than that....
But any way, I definitely agree with Adastra, maybe to get her attention in the beginning, you could add a few pictures of some cool looking homes with African Dwarf Frogs in them.
"Life is an adventure full of beautiful things, and a treasure worth more than gold."