I am not sure why her doctors are advising her
to wait so long
to conceive. She should ask them the reason. Usually,
ovarian cysts are removed without cutting into the uterus. So, having a vaginal birth is not considered risky if you have only had a pelvic surgery and not a uterine cut. But, only her doctors can recommend what is best for her since they know her entire medical history.
In the US, doctors sometimes prescribe birth control pills to help control cysts.