Check the McLennan Co, TX GenWeb site, some GenWeb counties are putting their cemeteries online. If not online, I do know some of their cemeteries have been published in books. Post your query, plus, ask if someone would check for death date on Bunlah. Tell them you need her full death date, so you can obtain a copy of her death certificate. That should show the names and birth locations of her parents. Important to post your query on county sites, as well as surname sites, because you never know what other descendants might also be working on this same family. Use both the GenForum counties and the GenWeb counties, you don't know which sites other researchers might be using, and getting your query on as many sites as possible will enhance your chances of finding other descendants.
If you know when and where Elwin died, you can do the same for him, too.
Have you looked at the 1920 census for Elwin and Bunlah? Then follow them back through 1910, and if they were married by then, the 1900 census, too.