"Aren't they just witnessing her signature like witnessing a signature on a will?"
No,they are certifying that she fully understands the full implications of giving the power to her chosen attorney(s), and that, to the best of their knowledge, she is not being pressurised in any way in making this decision.
No,they are certifying that she fully understands the full implications of giving the power to her chosen attorney(s), and that, to the best of their knowledge, she is not being pressurised in any way in making this decision.