The Shelton Lineage Letter states Elizabeth Holman's father was Isaac Hardy Holman, but since I found that person online, the two wives that were listed are not Elzabeth Donelson, and IHH had no listed children named Elizabeth, and had childres within a year on either side of Elizabeth's birth date.
I have therefore swapped Isaac to the online source since things seem to be more consistent. However, for the record, the Letter states:
Isaac Hardy Holman, born 1787, died 1875, with no further information.