josh, I think it's great that you want to help your girlfriend out...I'm sure it really means a lot to her, even if she may not be showing really well right now. Isolation is a common symptom of depression...I know I isolate when I am depressed. It is not healthy to isolate, but it's pretty ineffective to try to force someone out of their isolation. The best thing that anyone has ever done for me is to just offer things to do without pressure, and keep offering until I feel ok enough to take them up on the offer. It takes a lot of patience on your part, but it could really help her to know that you are there for her.

Is your girlfriend in therapy? If not, it might help for you to suggest it...if she is having bad feelings that cause her to isolate, then a good therapist may help her feel better about things.

Good luck
mj