I’ve noticed a couple of moments, a more subtle one is when Joel is beating the FEDRA guard to death and Ellie is watching with a morbid fascination, and then also the more overt one where she slices then stabs the trapped infected in this last episodes.

Not sure what they’re going for exactly with this, but I am open to whatever it is.

Nothing wrong with the lines Ellie says specifically imo, it’s pretty on brand for the Ellie we know from the game. Just the acting is a bit different, showing a sadistic(?) side of her for some yet to be discovered purpose.