
I think it depends on the cause of the section for example if it was because a puppy was stuck through no fault of the bitch and a section was required then I guess there is no reason not to mate her again as next time everything may be OK .
If she had say primary Inertia and required a section then I personally would not breed from her again, there is also belief that this can be heriditory.
Seasons I think vary from dog to dog and breed to breed.
Some of mine go 6 months later as normal but also some have went about 8-9 months.