text: I'm female and came out to my mom as bi when I was 18. It took her like 4y to integrate that YES I'm bi. While my big brother came out before me as bi too and for her he was automatically bisexual and she never questioned it (he also passed shortly after so conversation was over eh). She'll get to it, it can take her time, if she doesn't see you with a guy I think it's not 'really real' for her