| Jul. 1900 | ~0 | Roanoke, +, Virginis, U.S.A. | BIRTH. |
| 31 Mar. 1924 | 23 | -, Comal, Texas, U.S.A. | MARRIAGE: To Andrew Jackson Zilker Jr., age 31. |
| 28 Aug. 1924 | 24 | Austin, Travis, Texas, U.S.A. | BIRTH: Of son Charles Andrew Zilker. |
| Apr. 1941 | 40 | Austin, Travis, Texas, U.S.A. | Isabelle Henderson and Andrew Jackson Zilker Jr. filed for divorce in Apr. 1941 in Austin, Travis, Texas, U.S.A. |
| | Austin, Travis, Texas, U.S.A. | DIVORCE: From Andrew Jackson Zilker Jr. |
| 10 Sep. 1942 | 42 | Austin, Travis, Texas, U.S.A. | MEDICAL: Detained by a complaint & warrant for being of unsound mind filed by son Charles Andrew Zilker. |
| 15 Sep. 1942 | 42 | Austin, Travis, Texas, U.S.A. | MEDICAL: Found to be of sound mind after a court hearing & verdict. |
| | San Marcos, Hays, Texas, U.S.A. | LAST RESIDENCE. |
| 15 Jan. 1953 | 52 | Brownsville, Cameron, Texas, U.S.A. | DEATH. |
| | Hondo, Medina, Texas, U.S.A. | BURIAL: Hondo Cemetery. |