The fastest way I know of is to fill your inventory with "Anthology"s from the Dunbarton General shop for 150 gold each, go back and give them all to her. After You give her about 13 of them (You'll need more than one trip), Talk to her and click "Skills" after every new anthology you give her. After you give her a total of about 15-22 of them, she'll give you the book. That'll give you the rank F book. You can buy the books for E and D from her afterwards.
All takes about 15 minutes.
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