There are 2 separate issues:
1. considering a possible breach of power of attorney (similar to a breach of fiduciary duty). Basically an agent is a fiduciary and if they engage in self dealing, or if they otherwise "waste/mismanage" the principal's property, they are personally liable. If the court finds they acted willfully or maliciously, then the court can even award punitive damages.
This of course results in the court revoking the power of attorney.
2. appointment of guardian
Information on that process is here:
One can make a claim with the ward's estate, so that the estate pays for the legal fees to establish a conservatorship.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.