Thank you so much for your question. It is my privilege to be able to help you out.
If she truly has two separate uterus's, it is possible that one or the other may be big enough to carry a pregnancy, at least until the baby is viable.
If it is known that she became pregnant in one of the uterus's, and it is known that the one which was pregnant was the smaller and more abnormal one, than she should try to get pregnant in the other. If she only has one vagina, that may only be possible with artificial insemination, but if she has two vaginas, she should have intercourse in the other one (if possible).
If both uterus's are small and not well developed, then her chances of carrying a pregnancy are much less.
Since this problem is highly dependent upon her individual case, she needs to be evaluated by a specialist in this are to determine her chances of a successful pregnancy. the right specialist to start with wold be an infertility specialist.
I hope this was helpful to you. If you are satisfied please don't forget to ACCEPT the answer. BONUSES and positive feedback are always appreciated. If you have any more questions, please feel free to respond to this question. Good Luck! Dr. SaulJE