My best friend has become extremely self-involved, vain and moody over the course of the last year. She dropped 20 pounds and has started to hold court like a junior high queen bee. She's more of a "frenemy" at the moment. I'm so torn between making an effort too improve things or just stop seeing her. How much effort should I put into saving the friendship? She's going through some kind of midlife crisis I think.

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