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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
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So if your bunny is acting healthy and normal, and the only thing that really has changed is that things are bit chillier than normal, then her cold ears may just be her way of preserving heat. Just make sure she has some cozy blankets and a hidey box to help her stay warm if she wants to. But it looks like if she's doing eating and doing binkies, then she's not bothered much by the cooler temps.