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davidcyclebackYou are essentially like a family member that she is giving the family memento. And she genuinely wants you to have them, as you are the only one who has expressed interest or knowledge in the her relative. There is a specific and understandable reason she is giving you the album. It was a gift.
I would tell her that the album has financial value due to the cards, and let her decide what she wants to do. If she wants to sell the cards for the money she can decide to do that. If she still wants you to have the album as the only person to be interested in the relative, you can consider it a gift to you. If you then wish to sell the cards and give her money from the sale, you can.
As long as she is informed that it has financial value and still gives it to you, you can consider a gift a gift. You aren't required to sell a gift and return money to the gift giver, in fact many would consider the practice rude. Duly note, however, that if she gives it to you as a gift, she likely is expecting you to keep the album as a family member would and not sell it the next day.
Realize she considered her living relatives (the folks who would inherit it) and designated you as the person who deserves the album. And her reasons for giving you the album seem sound. Old people like young folks who are interested and apreceate their history, especially when others aren't interested.