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I am sorry to hear about this situation. If someone in your situation feels that the agent (that is, the holder of the POA) stole or embezzled or otherwise took care of the money improperly, they can take either criminal or civil action.
If you are a senior, she may be liable under the state's financial exploitation law. One can file a criminal complaint. If so, the authorities will get involved and may even charge her. In addition, she may also be liable for embezzlement if she stole the money or used it for her own purposes.
To sue in a state court, one needs to have a "cause of action." There are numerous causes of action, such as "breach of contract," "negligence," "fraud," "unjust enrichment," etc., as well as causes of action rooted in statutory law. Every state has their own although they are very similar to each other in every state because they all stem from the same common law. A pleading in Court needs at least one cause of action, although it is not unusual to have more than one.
Here, someone in her situation may be liable for breach of fiduciary duty, negligence, negligence per se, and a host of related actions.
It is not easy to SUE someone because this is a very complicated matter. An attorney is recommended. See HERE for pro bono attorneys if you need one, and many organizations focus on helping seniors.
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