Your mother, or you (or your other sister) as the "attorney-in-fact" or "agent" (those are the terms for the person granted power by a POA) on behalf of your mother, could sue that other sister for the return of any amounts she stole or took/used for her own benefit (rather than for your mother's benefit, which was her "fiduciary duty" as the agent--to not take/use your mother's money for herself). That's the recourse--to seek the return of the money in court.
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