Yes she can. Another interesting fact, a woman can get pregnant even if the guy doesn't come, because of the pre-ejaculatory fluids. It is believed that the muscle spasms caused by a female orgasm can help the semen to reach the cervix thus contributing to the pregnancy, but I don't think there is enough proof to support the theory. "not coming" is in no way a recognized birth control method. Not for a man and certainly not for a woman.