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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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Some bunnies are just made up this way, and the noise is heard more when they are fully relaxed or excited, but it's not often that rabbits have this issue, and since this is new to Sophie, I would keep a careful eye on her, and if it doesn't get better soon, then check with a vet.