You need to find an experienced real estate attorney in the local area to handle this for you, particularly one with some experience in elder law. You also need to ensure your mother is of sound mind and body for the transfer, or you may find yourself in a nasty legal battle over her estate once she is gone from other family who feel you may have taken unfair advantage of her to get her property.
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I agree with the other answers. You should consult with an attorney (either in Austin or Corpus, it doesn't really matter) to make sure this is done properly.
It should not be terribly expensive. If done improperly, it could cause problems with eligibility for her new housing, probate issue (upon her passing), and title issues (when you try to sell the property later.