Bud, according to T.Grant Maple, "Genealogical History of the Maple/Mapel Family in America", Rebecca never married.
This is what he has in his book. Albert Franklin Mapel b May 29, 1828 d Nov 14, 1880 m Rebecca Hansel d 1900. His will dated Nov 5, 1880 pro Jan 7, 1881 exr Stephen Mapel (Book 5, p 272, Greene Co, Pa). Rebecca Mapel d ca 1926 (never married). No other children are mentioned. Jude