I'm seeing the info about Elvis' Jewish heritage on many sites now. The Overview on this Martha's profile says that has been disproven, but other sites are showing convincing information that it's true;
https://thejewishnews.com/2021/07/14/elvis-presley-was-jewish-a-gra...
gives information about Elvis having a Star of David put on his mother's gravestone and shows a photo of it as proof.
Same here, as well as other sites:
https://jmoreliving.com/2021/07/14/rediscovered-grave-marker-appear...
Some of the sites share info about Elvis' introducing his rabbi to friends and about his attending Jewish ceremonies
https://forward.com/culture/461739/was-elvis-presley-actually-the-j...
and there being a Jewish menorah among Elvis' possessions on display in his museum in Mississippi
"In 2018 Elvis’s mother’s headstone was taken out of storage and put on display in Graceland. The headstone was designed by Elvis himself after his mother died in 1958. He included a Star of David in the top left-hand corner. A sign next to the gravestone now says that was to honour Gladys’s Jewish heritage."
https://www.thejc.com/life-and-culture/all/uh-huh-elvis-was-a-nice-...
So I'd say it's far from 'unproven'
More sites than not seem to have her as Martha Sue (Tackett) Mansell than Martha Cordelia (Tackett) Mansell. Some just have Martha. I haven't seen anywhere else showing the Elswick surname at all. I'm thinking two families have gotten their info mixed together.
https://famouskin.com/family-group.php?name=46925+martha+tackett&am...
This also indicates she's connected to the wrong parents. Her father Abner is possibly confused with another Abner Mansell, as her father wasn't born in Kentucky and didn't die in Alabama. He was born in the Carolinas and died in Mississippi, where she was born.
I'm reading and posting as I find info, trying to get them connected correctly in my tree, as we're multi-related to Elvis and I want to make sure I have the lines correct. The info I've found on her father so far is:
Abner Tackett
BIRTH 6 FEB 1803 - some show SC, others NC
DEATH JUN 1889 • Springhill, Lee County, Mississippi, USA
https://famouskin.com/famous-kin-chart.php?name=46926+nancy+j+burdi...
https://gw.geneanet.org/tdowling?lang=en&n=burdine&oc=0&....