unless your kitty is a proven representative of her breed( Purebred only ) , as proper breeding should ONLY be done by experienced breeders who breed to better improve the genetic lines of the said purebred cat.

However if your cat is just a regular domestic house cat, it should NEVER be bred as that only contributes to the overpopulation even more.
PLEASE get her spayed immediatley (actually at her age,it should have already been done ) so she can live a happy healthy life without having to raise any young.
Oh , and please try and keep her indoors as it a much safer environment rather than being outside.
If you can...please post us some pictures of her we all like pictures on here