From what I've found and seen, as a new grad you will not be able to negotiate your salary, whether male or female.
Most hospitals have limited spots for new grads, and perhaps have many new grads applying for the same position. It may be between you and one person, but if that person doesnt ask for 25an hour and you do - guaranteed the other nurse is going to get it.
However, as the above post mentioned, night and weekend shifts are your best bet for making the extra cash. Also, OT shifts can help you to rake in extra cash.
Another thought would be to apply to a hospital out of state in a larger city, one that does pay new grads around 25an hour.
Good luck in your upcoming graduation