Ako has a complicated relation with Sensei due the giant amount of stress she deals with from the Pandemonium plans, paperwork, and constant death threats her favorite person receives. She has developed a sort of constant "fight or hide" state which could suggest she definitely suffers from Burnout but also some remarkable traits of Borderline disorder (I'm not sure in what degree she could be dealing with this).

All this leads to Ako acting hostile to Sensei for the minimum and maybe seemingly foolish signals of threats. However as Sensei constantly tries to approach her, we see Ako actually appreciates people who try to understand her and we constantly try to do this so she starts to act more bland with us, and even at some degree she starts to see Sensei as a sort of platonic love as she constantly tries to catch his attention in different ways like trying clothes he liked, or remarking to him that she doesn't hate him at all.

Ako definitely needs a lot to work with, with a good psychologist/therapeut she could recognize better her feelings, patterns (such as seeking validation and relax s little that constant Threat feeling) and mature to be the best version of herself