Oh, I don't think they're necessarily putting her too low (though they might be). I still think she's toward the lower end of the list, for sure.
She has some stuff that's obnoxiously good and polarizing (F-Air size, air control with Solarbeam, and general edgeguarding ability, mostly) and a lot of stuff that's awful (Forward-B, N-Air should be good but is easy to escape before the end hit, super-low grab).
The main stuff would be to give her a moveset that allows her to realistically "use all the buttons." F-Air currently overshadows most spacing stuff, and almost all of her moves are CC-able. She needs differences in specific uses on moves that would give her a more dynamic playstyle, and she needs some stuff to encourage a stronger combo game. I don't want to go far in-depth for potential changes, as I want to test/keep some stuff for potential 3.0 hype. I've posted a little about it in the Ivysaur subforum, though.
That said, she gets camped to hell by opponents who are good at camping and has serious trouble fighting the most dedicated rushdown characters, while the optimal playstyle appears to be pretty boring and requires little adaptation. She's just in a bad spot all around, I feel, though she probably have some niche matchup wins and is pretty powerful if an opponent doesn't understand how she works and where her weaknesses lie.