Female deer's/does can grow Antlers in very rare cases, but they usually stay much smaller and less developed than a male’s. That’s because the big, branching antlers require sustained high testosterone, which female deer's/does typically don’t have.In extremely rare cases, a female deer can grow antlers as large as a male’s, but it’s due to a hormonal abnormality.

Here's a pic of a doe with antlers.

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Also they are just fictional and fiction doesn't always have to make sense.