lol, I can NOT explain why there are so many "landscapers", garden dudes, fence builders AND sustainability people cropping up around this case. The disparate communities don't really have anything to do with each other.
The stuff that Dede appears to have been 'into', based on reading her blog & tweets, falls under the 'sustainability' community (my shorthand description). She got involved in several, loosely related activities around nutrition, home food production, the locavore movement etc. She had been accepted into a 'gardener to farmer' internship by a local woman, and I think that is how she got onto the project at Westwind Farms. Strictly a volunteer thing where (that day) they were cleaning up the property for a Hardy Plant Society benefit tour. Extremely benign, full of peace/planet-loving types and not directly related to ..
.. Landscape maintenance workers, yard dudes, fence builders et al.
Now, could you find an intersection in that community with gangs, hitmen, criminals? I never did, when I had yard guys (hi Andy & Gary!). But I may have been limiting myself!
Dede seemed more concerned with hanging with the marathon/cycle crowd, her gym folk, and more recently volunteer activities with small farms (Rosemont) and DIY handicraft stuff (knitting with old ladies). On the face, very wholesome, and living in a condo-landia in the 'burbs, I wouldn't automatically assume she knew bad guys because of this very loose association of "yard work".
Just my take on it; HTH.