She might not be putting out pheromones right now. Keep pairing her up and eventually the male should trigger her instincts. Did you double check that your male is in fact male?
this is my first season breeding and I had the same issue with one of my females. Shes proven and big enough but my male would not lock with her. After 3 months they finally did (for almost 2 days straight!) and nothing has changed since the first pairing. He had been producing plugs but had zero interest til now
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