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hankronAs I said, you are offering her a useful service. It would unfair if you took several hours to correctly valuate and grade then off her hands these cards that she apparently doesn't want around anymore. She likely has no desire to list them individually on eBay and research individual prices in SCD. So there should be no guilt involved for making a profit off of the transaction. She'd be ripping you off, if she expected you to do this free of change or at a loss.
However, you should still pay her a resonable price.