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Are you saying that the daughter has a POA that takes effect once the mother becomes incompetent and you are asking whether she can instruct you or not and the concern is that she is a resident of the US?What provinces this please?.
Yes as it is not the daughter's. She just acts in place of her mother and she can do what the the mother could do if competent.
So as long as you are sure that she has authority to act when the mother is no longer competent then it would be fine.