I can see her being bitter/angry with everyone, even moreso than she has been already... she'll really start to look like Ellis.
I think they're trying to make her as close to "Ellis" as they can -- just hoping she will snap out of it before it's too late.
Before it was Derek taking his anger out on Amelia, now Mer will probably. I gotta feel sort of sorry for Amelia. She's probably felt the rift the most from drama de MerDer.