Sometimes it might just be the contrast in different flooring that has them unsure. Still, carpet to carpet shouldn’t be a problem… you could try puting a darkish colour mat just outside the pen door and test whether that’s it.
Does she act like she wants to come out but is afraid or does she just ignore the fact the doors open altogether?
Couple other things you could try is:
- try giving her pellets just at the threshold and keep moving them gradually further and further out if she needs encouragement.
– provide a tunnel or a hidey box just outside the pen. She may need to identify some safe spots when 1st coming out.
- be in the bunny room but away from the pen and doing something else. Rabbits are so curious and this might prompt her to venture out and see what you are doing. If your down on the floor she’ll be able to see you across the way. You might have heard of this “floor, ignore” technique? It’s good for when a bunny is new and you want them to approach you on their own.