I'm sorry to hear you're being treated like this. If teaching certain skills is part of her job description, it's unprofessional of her to blow off people she doesn't feel like teaching.
Maybe you could ask a manager if there's somebody else you could see for language tutoring, because this particular librarian has clearly been evading your requests. If the manager says he'll talk to that librarian about meeting with you, I'd suggest reiterating that you'd rather work with somebody else.