Welcome, Womble,
How long have you had Terry? If she’s still pretty new to your home, I wouldn’t worry.
Must bunnies view their houses as a safe place for the most part. They explore the outside territory in ever widening circles. And they are creatures of habit, too. She probably is checking out your home slowly, then going back to safety. As time passes she will venture farther and longer. Just watch to make sure she eats and poos regularly, and isn’t hunched up in her cage or grinding her teeth loudly, as that would indicate there’s a health problem.
It’s good that she lets you pick her up and is comfortable with you. You may actually be giving her too much freedom. Can you build a little enclosure outside her house so she can spend some safe time within a confined, but larger, space? A dog exercise pen is perfect for that. Also, you can attach NIC cubes to make an sort of fence. If you can close off the room she’s in you could just let her run in there (be sure to bunny proof it) and sit on the floor to keep her company. They learn quickly, and you’ll be searching for her all over the place in no time.