Spamming sites still worked pre-hummingbird and infact it works even better now.
Even Negative SEO works just as well. Have a competitor you don't like? Give him 100k blog comments with "Buy Viagra" and suddenly he will be de indexed in 3 months or less.
I think half the reason she quit is that SEO is so damn unpredictable now. You can make a spammy site and might rank or might get de-indexed. But at the same time you can make a 100% whitehat site and it probably won't even rank and can get just as easily de-indexed as a blackhat spam site.
You need to read up on BlackHatWorld a bit more Mr Cutts.