There is a death certificate for M. E. Pace, named as wife of R.J. Pace. The information is confused, because the informant put Martha Ellen Keepers as the maided name of ME Keeper's mother. The name of her father is wrong. Her date of birth is consistent with census records; her tombstone has 1855-1933.
The below link takes you to the beta site for familysearch.org where you can find this death certificate.
Republic of Texas Claims (Searchable Database) The Republic Claims series of Comptroller's records includes claims for payment, reimbursement, or restitution submitted by citizens to the Republic of Texas government from 1835 through 1846. It also includes records relating to Republic pensions and claims against the Republic submitted as public debt claims after 1846.
Service Records (Searchable Index) The Service Records Series combines both official service record files from the Adjutant General's Office and alphabetical files created by other agencies which contain records related to an individual's service in a military unit.