She was probably just nervous about being in a new place for those first few days, and now she's feeling more comfortable and is excited about exploring the cage and her new place. If you take her out at night, make sure that you are in a glider safe place (outlets covered, mouse traps removed, breakable things taken away, a towel under the door so she can't squeeze out, etc) so that if she does get away, she won't get hurt.
Gliders are naturally very active and energetic. I wouldn't worry about it. :) Does she have a glider safe wheel? They absolutely LOVE their wheels and it gives them a good outlet for all of the energy!