I would suggest Firefox with AdBlock installed. Sit there for a half hour or so, surfing the net (instead of her). Block all those sites that host the images (doubleclick, etc). If she doesn't see them, she won't click on them.
That's cool - but I'm talking about the *links*. Not necessarily ads.
I don't know where she's surfin'. But she's takin' her Cadillac to Compton and gettin' stomped. Oh well - it's my cousin's problem. ;-)