This is a civil/personal injury question as opposed to a DUI question. I would suggest reporting in another section.
This is not intended as individual legal advice and there is no attorney client relationship established by this answer. It is advisable that you seek individualized legal assistance. This is not a substitute for hiring an attorney.
In general, your power of attorney should be notarized and have an acknowledgement page signed by you indicating your acceptance of the power of attorney. Also, the hotel is only responsible if their negligence caused the fall, such as having water on the floor, excessively waxed, etc. But based upon your description that does not seem to be the case. Nevertheless, they may have insurance with a Med Pay provisions for medical expenses. If medicare has paid for her medical bills, then medicare will have a right to be reimbursed from any amounts recovered .
Sign up to receive a 3-part series of useful information and advice about personal injury law.