I think she would be fine if the writing was better tbh. The writing and dialogue just has her coming across as incompetent, and childish/immature. Its really like watching part 1 Ellie trying to do what part 2 Ellie does, and it doesnt work. Part 2 Ellie obviously grew up a bit, and is a pretty apt survivor and killer. S2 Ellie just isnt that. Theres a lack of competence, maturity, and frankly rage and thats all attributable to the writing changes. Its possible that she would fail to portray part 2 Ellie if the writing werent so flawed, but its impossible to know that, and I dont see issues with her acting ability. Dina and Jesse are both written well and come off – again – as more mature, more competent, and more serious than Ellie, which is why they look better in contrast to her character.