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Legally, the person with the PoA has the sole right to make decisions for your mother until someone goes to court and obtains a court ordered guardianship over your mother, which would then override the PoA. I am afraid that your sisters do not have to tell you where they are moving her by any law and the sister with the PoA has all of the legal rights at this time.
If you want some power, then you would need an attorney in Alabama right now and you need to get them to file a petition for guardianship in Alabama courts and ask the court to name you guardian or even name all three sisters co-guardian (in which event the majority would rule on all decisions involving your mom, but you would still be entitled to information about her condition and where she is located). Absent the guardianship or co-guardianship order from the court I am sorry to say the person with the PoA can make the determination and does not have to tell you or even consult you and I know that you do not want that, so going to court and getting guardianship is your real answer here.
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