The female's pelvis starts fusing as they grow older, so breeding after 1 year is dangerous and usually fatal, as her pelvis has pretty much fused.Kobe said:
Where did you get your girl from? Is this your first hedgehog? Why do you wish to breed? Are you planning just 1 litter? Do you have a mentor to help guide you? Does your girl have a pedigree?
Did you buy her from PapilionRu(on this board)? She is the only real reputable breeder in Toronto right now, and she's the only one with hedgehogs that would actually be considered breeding quality. So it may be wise to contact her directly and talk about whether your girl is actually breeding quality or not. Or perhaps just have her as just a pet for now, and then think about breeding by the time you are ready for a second hedgie.
And, as you can see from her post here http://hedgehogcentral.com/forums/viewtopic.php?f=25&t=8958&p=76042#p76042 it gives a brief sum of how much it can all cost, obvious not nearly as much since you seem to only want 1 litter, but either way, still good to have a few thousand dollars on hand(or by credit) for emergencies if you wish to breed.