According to Wikipedia's "Five Pillars," Wikipedia is an encylopedia, not a newspaper.  The photo of Cynthia's mugshot is something that would be seen in a tabloid newspaper, Entertainment Weekly, or People Magazine (and that's only if they were desperate that week), not an encylopedia.  The difference between her mugshot photo and the celebrities that you've mentioned is that they are CELEBRITIES, and I feel she isn't a celebrity.  Everyone you mentioned is famous enough AND/OR their crime was (in)famous enough to warrant a mugshot photo.  

If the reason of keeping the photo is that it relates to the article, I say that the drunk driving section is overkill.  It's tabloidism.  Granted, she isn't completely unknown to the public or unpraised by critics, but the entire drunk driving arrest section should be a blurb.  Also, her fame (or lack thereof) and the lack of severity or newsworthiness of the crime (even though I loathe drunk driving) is why the photo should be removed.  I think almost everyone else on this discussion page agrees with the photo removal.