You didn't include any dates, or approximate dates, in your query, but I think this is a "possible" match.Combined info from TX Dth Idx Online and SSDI:
Agnes J. Wells, b 21 Oct 1882; d 30 Aug 1973 El Paso Co, TX; last residence El Paso, El Paso Co, TX; widowed; Soc Sec card issued in CO.
If this is a match, you might look for an obituary for Agnes, survivors are usually listed, and a good way to pick up the married name of that daughter she lived with.Hopefully some grandchildren will be listed, too.They may be the ones who are now living and you could make contact with.
Check the El Paso Co, TX GenWeb site, some GenWeb counties are putting their cemeteries online, you may find Agnes buried with members of her family.Post your query on that site, too.Maybe members of her family will recognize the name.