So I recently (a few days in-game) finished Forest Witch quest. I got Ciranha's mother's momento, went over to her, she thanked me and it said I got her magic book. Neat.

But i don't have it. I still have the momento. A momento I can't place, sell, drop, or do anything at all to get out of my inventory. I can't trigger her to recognize I still have it either, and she's done a few random quests since then too.

What do I do to get her book and get rid of this undroppable thing?