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No there are not international laws concerning this sort of thing. Each country has their own rules concerning the procedures necessary to establish a power of attorney.
It is highly unlikely that any POA that you do here will be respected in your home country.
You'll need to work with a local attorney to where she is, and ask how they propose you get that document notarized here. Sometimes, they'll accept our notarizations. Sometimes, you'd need to find a consulate in this country which some connection with your home country to have that notarization considered in your home.