I base the claim that she is John & Elizabeth’s daughter on the 1821 guardian info. (SV-480)
1821 Christian Fauber, guardian, Pleasant Ewell, surety, Elizabeth Cress, orphan of John Cress. (SV-480)
Note: My database on Sep. 2001 had no other John Cress born prior to 1800, so by process of elimination John, born 1767, is the one!