What are the chances that a woman may become pregnant after a ruptured appendix? she previously had a child prior to the rupture.

Hard to say: For most, it is likely to have no effect at all on reproductive capability. The involved systems are in separate body compartments. However, if the rupture led to an extensive infection and scarring within the pelvis it might. Those involved in the treatment of the problem would have more information to review and provide a more specific answer.