While I do not know this particular family and have just done a cursory check, I did find a marriage of a Mrs. Pearl Appleby to a J.D. Jenkins. See https://familysearch.org/pal:/MM9.3.1/TH-1-159393-956314-75?cc=1709399&wc=M9QJ-F3X:1575964134 for the marriage license.
And there is a Pearl Jenkins buried in Noble IOOF Cemetery: E-4-R14-6 JENKINS PEARL 9/15/1894 8/28/1933
The vital dates match your Pearl Riggs, so it is possible that your she married twice and is buried in the same cemetery as her parents under the name Pearl Jenkins. You'll have to evaluate these records to determine if they are indeed of the same person, however.