sorry my original post was not clear, but Moniteau county formed in 1846 and my Nancy arrived while it was still Cole county jurisdiction. She was already Nancy Brown.
Your Nancy Allee was born about the time my Nancy Allen Brown died.
Your are right to double check records with Allen and Allee in the index. The old records are thoroughly mixed as the handwriting was not easy to read.
The timing of your post is unbelievable. I just finished a note to my father regarding the sorting we need to do with all those Browns of Moniteau county. There is a Brown Cemetery in Moniteau and it is not where our Browns are buried. Keep sorting.