You might be interested in going to interment.net and looking up Carroll Chapel in Mitchellville. There is a list of those interred there. There is a book called Lost Towns of Tidewater Maryland by Donald G. Shomette that has a lengthy chapter on the history of the town of Queen Anne. Maybe some names wil lead to further discovery.

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: The 1861 Martenet Map of PG County shows a
: McKendree Chapel in the Queen Anne District,
: on Queen Anne Bridge Road, about a mile west
: of the junction with Mill Branch Road. This
: is very near the location of the first Mt.
: Nebo Church. The oldest known grave in the
: Mt. Nebo cemetery predates the first Mt.
: Nebo church by 17 years. Does anyone know
: anything about the McKendree Chapel and if
: it had a cemetery associated with it?
: