Incadescent Mask - Madame Serena won't give up the rune

[Crosswind]

I'm a dark elf, looking to do the incandescent mask quest.

I have boozed up Captain Roland enough that Madame Serena, when I am in Illusion: Human with Alliance, cons WARMLY. She cons amiably when I am in dark-elf form.

And yet, when I drag 5 plat onto her for the quest, she will not give me a rune, and takes my money. Wench!

...whaaat am I doing wrong here?

-Cross