You only get fertilizer from it, no seeds. And it only works when you won a battle against her before.
You should've obtained the yellow cooking book after finishing the visit with Kayelinth in Rakake, when you finish the quest "Food Town."
Is the quest finished in your questlog? (Toggle left/right to see complete quests in the questlog)
Have you checked the key item category for the recipe in your inventory?
I've done food town quest since you first release that quest. But if i'm not mistaken, I'm visiting rakkake since you release new maps rakkake and Greencoast Tower and buy many foods, that's before you release quest to visit Rakkake.
Here the screen shot of my inventory, i cant post save file because i'm android player