5 months isn't such a long time to be out of touch. Would you be willing to consider another meeting with her once again, and be very open, just as you have with us? If both of you recognize the shortcomings of the friendship, maybe it can be salvaged by finding more in common than just discussing people at work. I don't see how you would have anything to lose by trying.
I understand, but I sometimes force myself out of my comfort zone. Most Sundays, I go out to eat with a group of 3-6 people.. The conversations are usually casual. It's not so much what we talk about, but that we are enjoying some company now and then; sharing bits and pieces of our lives. These Sunday lunches aren't necessarily intended to foster deep friendships, but we are maintaining a human connection, and (for me) it beats becoming reclusive.