I get her character is about moving on from your past, the whole "the past doesn't define me" stuff. But it would have been nice if we saw her grief for Equestria or whatever, you get what I mean.
I was thinking of Sunset having complex grief (even though she chose to leave Equestria, which I think would cause some major psychological problem) *But* we can see she's not really grieving who she used to be back then in Equestria (for obvious reasons Lmao), but it'd can also-
-be for other reasons, like her losing her relationship with Celestia, and maybe homeland. Not really though, Sunset just doesn't seem to "care" that much about her life in Equestria from before because she was just focused on being the princess other than her surroundings.