Ivanna was also crazy good in this movie. She shifted so perfectly between the different roles that Amelia was inhabiting in the different scenarios. Also I have no idea if this was an intentional choice on her part or some kind of language barrier thing, but I swear at one point in the film when she was talking to M3gan it sounded like she had changed her cadence to sound like those AI voices you hear on Youtube videos, not the obvious tiktok "OH my gOd, you wOn't beleev this thing!" but the cloned voices where it sounds like a person but regardless of the emotion being conveyed the cadence never changes pace and the pitch never varies.
Also I know that her wide-eyed autistic stare is what most people love about her, but it's obvious she has really fantastic subtle muscle control all through her face.