No, they are induced ovulators, so the act of mating makes them ovulate. What an interesting observation, though, I wonder why! Is there anything different in her diet occasionally which might account for it?
Is your little one spayed? I would strongly recommend you get her done if she isn't, as the risk of uterine cancer is really high in female bunnies, plus it will make her much calmer and feel less territorial.
Good luck