Cute, cute, cute! Libby will do that too! They sure make their wants known, don't they?
Angelina, my Parrotlet, is in an HQ flight cage, just like Libby, and she'll run back and forth on the bottom like that when she wants OUT -- and it's quite a run for her little legs! I always say I'm going to get her a teeny weeny tin cup to rattle back and forth on the cage bars! LOL!