
If you are not going to breed her and she will only be a pet, then I would consider speying, However our bodies do things for a reason, should we leave it as nature intended?
I would say If you are not going to breed or show, then do spey, to prevent any accident. But before you spey, let your bitch have a couple of seasons first and "grow up"
Just out of intrest, when you say "pain" to you mean the pain of the season,which there is none that I know of. Or the pain of the operation where they don't feel a thing except maybe a bit of a sore stomach afterwards!