Melody's always had an air of superiority to me, she's always seemed like a selfish, judgemental person pretending to be a humble, modest christian. I think she's always looked down on people who disagree with her or more importantly arn't of her religion, the way she spoke to Nicole at the halloween party kind of proves it, "Someone like you." While I relaise she was refurring more to just the fact Nicole isn't christian it's just always been the immpression i have got, like she and those like her (Geoff) were so much better than anyone else.
That said, I do think Celeste is doing a great job, otherwise i wouldn't dislike her so much I would say i want her character to revert back to her old self pre- this whole triangle fiasco, but clingy, desperate Melody wasn't much better so there's not much that can be done.