Elena Gilbert in the books does not have children,as in the series.So,maybe you thought of Nina Dobrev who plays Elena in the series - no she hasn't got any children.
The uterus is part of a woman's reproductive system that is located in the pelvis between the bladder and the rectum. The uterus is the hollow, pear-shaped organ where a baby grows. The narrow, lower portion of the uterus is called the cervix. The broad, middle part of the uterus is called the body, or the corpus. The dome-shaped top of the uterus is called the fundus. The fallopian tubes extend from either side of the top of the uterus to the ovaries.
The uterus is a inverted pear shaped muscular organ located in the middle of the female pelvis, between the bladder and the rectum. It is suspended by ligaments in the abdominal cavity. It is basically made up of three parts: the cervix, which is the lowest portion attached to the vaginal canal, and the main body of the uterus, the central part of the organ and the upper area known as the fundas or dome.