I think AngstyLady is onto something with her suggestion -- do you think your friend is a bit narcissistic?

I would not feel bad about distancing yourself from this friend. If she only talks about herself, that's pretty selfish. I have had friends like this also and have found that the only thing that really works for me is to end the friendship and find people to spend time with who are less draining. It has also made me much more aware of my own tendency to complain!