I checked out the find-a-grave info and see that she was buried as Elizabeth Reeves.Since she died in 1955, that's too soon for records to have become public, and death records usually are not deemed public information.But I did find this:
For births and DEATHS after 1903, and marriages after 1966, write: Department of Health, Bureau of Vital Statistics 1100 W. 49th Street P.O. Box 12040 Austin, TX 78711-2040 Tel: 512-458-7111 512-458-4751
You have the name she was buried under, as well as her dates of birth and death, so you should be able to obtain a copy of her dc.
I am also pasting the Marion County contact, altho they may not have death records on the local level: Martin County Vital Records Martin County Clerk Courthouse Stanton, TX 79782 (432) 756-3412(432) 756-3412