If she were an alpha, her behaviour matches that of a childlike type more than a caretaker type. I haven't seen SEI girls pretend to be stupid like that either. By that logic I should be pretending to be an autistic meatlord to attract IEIs, but it's all candid. She seems to be self-aware. Like you said in the makeup video, she dropped masks then -- meaning this childlike elf persona is entirely constructed.