My Tinkerbell is the same way, so I can relate. I need to get her out more also. I once took Tink to my relatives house to stay for about 2 hours, she has a few little dogs to play with. Tink sat by the door on alert for me the entire time, she would not budge, and when I got back, she then played and had fun with everybody.

She has her comfort level, and it's with me. It's hard when I work at home, I rarely go anywhere that she can go so it's hard.