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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
Since your gal has not been bred and she is still quite young, this may still be a transitional phase for her. The fact that she still has nucleated cells on the vaginal smear tells us that she is still in the proestrus period and not yet into Estrus. Your gal will not show interest in the male until she is in full estrus. I know that this proestrus period should be 7-10 days but with a transitional bitch, this could be longer.
It is odd that the progesterone levels have decreased but I believe that they will continue to increase and this minor difference is a fluke and they will rise after this until she is in full estrus.
Continue to test progeserone levels and vaginal smears to know if she is getting closer to full estrus. This may take longer than the books say it should mostly because she is still young.
Does that make sense to you?
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