Aside from Bobby maybe, all the central characters on New DALLAS are morally ambivalent. That's almost the motor driving this thing: who are these people, and when push comes to shove, how far will they go and where do their loyalties lie? So Sue Ellen's moral waverings, far from being her USP, are only what all the other characters are experiencing, except they're doing it at twice the speed and she's sort of getting left behind.
But I can empathise with LG. I too know what it is to have a not-as-well-defined-as-everybody-else's role in a hit TV series, only she's a far, far, far more important player than I ever was. #ThankGodForRepeatFees.