My 87-year-old mother has drawn a revocable trust.

I will preface this Answer by stating that I am not an attorney in AZ, that I have not been retained to render this answer, and that it should not be used as a substitute for obtaining the advice of an attorney in that state.

Based upon your question, I understand that you are the sole designated successor trustee, which means when she passes, it is your responsibility to administer the trust according to her wishes as provided in the beneficiary provisions of the trust. Further, the trust will only govern over property was placed in the trust (ie, the deed should be holding title as " your mom's name as trustee of your mom's name revocable trust dated January --, 2009 or something similar) Provided the property is in the trust you are also the sole heir under the terms of trust, you would normally, upon her passing administer the trust. As it relates to the property, you would file a document entitled affadavit of death of a trustee with a copy of her death certificate with the county recorder where the property is situated. Thereafter, you would file a new deed transferring the property from the trust to the beneficiary (you).