Tree frogs sleep all day so if she wants something that is active during the day darts or fire belly toads are probably the way to go. I've never kept darts but I imagine the fbts being a lot easier and cheaper to care for. And while fbts are much more active than frogs like pacman frogs they spend a good amount of time just chillin in the water.
Sent from my LG-P930 using Tapatalk 2