the house can be sold for back taxes if the owner is not paying them...
if she is in a nursing home and has problems with mental faculties, I believe the state would have to appoint a legal guardian for her--but the APS caseworker or the nursing home SHOULD NOT give you any information about the woman or suggesting what you should do regarding her house because 1) they are not legal authorities and 2) no matter your relationship since apparently there is not a medical release of information on file--even nuring homes are required to abide by that new law I believe...
sometimes nursing homes have state-appointed ombudsmen (or women) who volunteer their time, receive training via the state, and have oversight/input into the care and situation of usually elderly residents in nursing homes...
I think they can give testimony in court proceeding and be asked to be conservators, basically, for the person before the person passes away...
I see ads asking for volunteers from time to time as public service announcements in the paper...
YOu can use this web address
Texas Legal Services Center Home Page
which is for the Texas Legal Service Center has links to lots of state/legal info sites
and this is to the Ombudsman program
The Ombudsman Program provided by Area Agency on Aging of Southeast Texas
which might also be of assistance...
but again I am not an attorney and my advice is not "legal" advice...