Unfortunately I cannot provide an answer that is anything but speculative, as the effect of anabolic steroid cycles on a woman's endocrine system are quite different than with a man's, and I have chosen not to do any female steroid cycles except for the wives of men I did consults or were personal friends of, and these have always been conservative. So I do not have practical experience in situation such as yours.
As opinion I don't think there's any way to recover normal function while using Winstrol to try to remain ready for your contest.
As to whether ovarian atrophy occurs with a long fully-suppressive cycle, as yours has been, as with testicular atrophy in men I don't know.
If it does, then a male-type program such as 250 IU every other day for a month may be fine.
If it doesn't occur or is unimportant which I suspect, then that would be irrelevant. For menstrual cycle restart, if that's what you mean by PCT, my speculative suggestion is 5000 IU at a time at the same intervals as what menstrual cycles had been. E.g. if 28 days, then per 28 days. This is based on natural timing of LH peaks.
I tend to think it does not occur or at least not to great importance, from the fact that women who have extended shutdown from GnRH drugs do recover estradiol production without use of HCG.
Also estradiol is produced more by the active follicle than from the ovary as whole, which might render the atrophy question moot.
As for Clomid or Noldadex, can't even speculate as the female interaction of estradiol levels with cyclic LH production is much more complicated than with men. At some points in the cycle, anti-estrogenic effect would even be counterproductive, and it's unknown and unclear to me whether it would be beneficial at any point.
The solutions I have known of, for cycles I didn't do, were simply matters of cessation and waiting, though with your contest coming up I understand that that wouldn't be your plan.