i think she is initially team kaz cus he just exudes like... reliable shounen lead energy? so the two just vibe well with the other and be bros. but she thinks shiro is very cute and fully supports/respects his relationship with kazuki! she protects these boys with her big axe and sword 🥰❤️

this is a boring answer but i think she likes both! she is very puppygirl-coded but to her, both cats and dogs are cute and charming in their own ways.