This is a hard one. I have two Hermann females who whistle. Charlotte I have had about 7 years & like you I took her to the vets who could find nothing wrong.
Another very old lady I rehomed more recently & her owner of 20 years said she has always whistled (never seen a vet, never been ill)
It makes them easier to find when they're hiding in the greenhouse!
Its worth getting her checked out & keeping a close eye but some just "do" whistle.
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