Amazed she can find the email to respond to it. (Maybe she has a better spam filter. I don't think she's on gmail.)
Late comment, but I remembered this (and the weirdness of sending letters back!). However I came across these gmail hacks and wondered if they might be useful for you.

(It's possible I get spam in my gmail, but it vanishes into the different tabs and I never see them. Occasionally I go in and mass delete a bunch.)