Either accept her as she is, or let her go. My personal opinion is that it's better not to spend too much time and energy on these types of people. It all depends on what you want out of the friendship, though. Perhaps a good way of maintaining a relationship with her is to give her as much as she gives you. Nothing more, nothing less ...though it wouldn't surprise me if as soon as you do that she miraculously becomes super interested in you again.