Pretty sure it is not investigative.Are you sure this is not Hello pecks and investigative pecks, I know you described it before but can you again please? She draws blood? She is fierce about it? She vocalizes aggressive sounds? She tries to drive you away? Is it a dominance thing?
If I turn around she draws herself up tall and puffs her chest out and lunges at me. So it feels like dominance. But she is also afraid of me because if I am standing in the doorway she is hesitant to come out while everyone else happily squeezes past me and mingles around my legs.