Check out this Hairpin article - I don't believe I've ever heard this argument articulated. Possible the most insightful paragraph:
"The Twilight series challenges what I would call the "Buffy Summers Maxim": that teen heroines be physically empowered, oftentimes at the expense of emotional clarity. Bella Swan diverges from many of our more recent teenaged female heroines. The ones who appear in films — the feisty Olive from Easy A, the quirky ironist Juno MacGuff — often seem to be written by thirtysomethings seemingly desperate to revisit high school to work some alchemical magic: turning the abjection of it all into a badge of indie cred. But even the more complicated female heroines of recent young adult fiction — Katniss Everdeen of The Hunger Games or Katsa of Graceling — embody a suspiciously pleasing, "empowered" form of female adolescence. These girls go through a narrative arc, but for the most part, they are already-formed subjects with the "right" values (freedom, self-determination, physical strength) that simply have to navigate some growing pains."
I would argue that Bella doesn't truly represent the typical teenager anymore than Olive, Juno or Katniss, but at least the last three take active roles in their stories.
