At the end of the last chapter, MC referred to her as a 'girl who speaks like a boy', as in a girl who uses 'masculine terms' in japanese language (think of 'watashi' for female 'I' and boku for male 'I').
There was probably some confusion in this one's sex because of her use of terms that don't match with her identity, but I imagine this being the author's way of portraying the tomboy trope in a different form. Despite how she uses the language, unless there's some unmentioned omnipotent power among the gods that allow them to freely change their appearance in both the male and female form, she's clearly a girl.