Oh, the worst offense is definately the stinky seafood!! P.U.!!
Is this is a dorm environment? Do you have an RA who you can meet with as a group? I know sometimes it hard to just do it as a one-on-one when she sounds so dissimilar, so maybe if there was a neutral 3rd party there, that would help?
Alternatively, you could just throw all her stuff out the window and pour beer on it.
You deicde. Emmy