Zoey strikes me as some sort of a cross between Maya and Josy, psychologically -- she's socially awkward and has hard time accepting her mother's new(?) marriage. She opens up with the MC but i'd agree she doesn't seem like someone who'd be going out and actively pursuing casual sex just for the heck of it.
the description of her, despite the interlude, remains the height of the generic
the family issue is also the height of the generic: she has a stepfather with whom she does not have a good relationship, and this is so taken for granted that there is not even a why, it is not even clear which of the two started the war (for Josy at least we know about a generic accusation of taking her father away, though she understands her father...okay)
Zoey could be an introvert like Maya, only unlike her she vents this limitation by pushing away those around her (MC, her mother, Emma...), wanting to be perceived as strong. Maya at least is more honest in this.
With Josy I see far fewer points of contact, at the cost of being wrong Zoey does not let herself be told what to do on almost any occasion, she has a fairly strong will