Lois, thank you again."Dicey" was definitely referred to in a few records as "Leodicia", but you are certainly coming up with some interesting coincidences in all this.
Alfred Ferdinand Rea was definitely the son of Nathan Rea (who m. Frances Moody), who in turn was the son of "Dicey"/"Leodicia" (Unknown) Rea-Nail-McBee.
After the death of Benjamin Nail, "Dicey" married Silas McBee, the latter of whom died in 1846 in Pontotoc Co., MS!
The Dicie Mugbee you found in the 1850 census has definitely got to be her.I had not found that name yet, undoubtedly because it was so garbled.She died at the home of her daughter in Itawamba Co., MS in Dec 1854.
Since you seem to be very well-informed on these Reas/Rays/Wrays, you might be interested in looking over a research paper I composed, setting down everything I know (or think I know), and how it all fits together - everything cited as to source.If so, just drop me a line, and I'll be more than happy to send it to you as an email attachment.