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There is nothing in the information you have given, that might point to illegal activity other than your mother's response.
The only way you can know is to see a copy of the trust and the power of attorney to see if the trust and the power of attorney rules are being violated.
This this end, you can hire an attorney and file a petition in probate or superior court to have the trust audited to gether with the terms of the power of attorney.
This would be a second question. However I will answer it as a follow on.
Cities and states are subject to cause of action law suits and claims regarding these types of trip and fall accidents.
Many have a process for filing a slip and fall claim, rather than a process of lawsuits. Again, and attorney who specializes in slip and fall would be needed in order to proceed with a claim. The claims process is usually set up to allow a simple filing of a claim without an attorney, but is generally limited to signing a disclaimer barring further ligitagation and only cover cost of medical care. If you seek larger compensation to cover disability, pain and suffering, you will need an attorney.