Yes, dates are very important - queries should always include NAMES, DATES, or approixmate dates, and LOCATIONS.Suggest you look up towns, so you know names of counties, too.Most vital records at county levels.Here is a site to use hope it helps: http://shiva.pub.getty.edu/tgn_browser/http://shiva.pub.getty.edu/tgn_browser/
You might try Henderson Co, TX GenWeb site, some GenWeb counties are putting their cemeteries online.You might find Wealthy's grave site.If they haven't placed their cemeteries on their site, post a query, ask if anyone knows if a book has been done on local cemeteries, and does anyone have access to it.Tell who you are looking for, too.
Since you have a possible location of death just for her, sounds like Jacob died earlier, and good chance she lived with some of her children in her last days.I would start looking for all of them on census records.
Combined info from TX Dth Idx Online and SSDI: Willie V. Baker b 24 Apr 1914, d 1-21-1971 Jefferson Co, TX, SS card issued in TX, and shows "single", but that can mean widowed, or even divorced, and could just be an error.Beaumont is in Jefferson Co, TX.
Combined info from TX Dth Idx Online and SSDI: Ethel Mae b 11 Feb 1909, d 1-19-1983 in Jefferson Co, TX, --- last residence Mount Pleasant, Titus Co, TX [sometimes that actually is where final payment was paid], SS card issued CA.
First part looks to be yours, but not sure about info from SSDI.You have a lot of information to work with, just follow up on more details, you might find even more.Happy Hunting.