Your sister either has a Enduring Power of Attorney (pre-2007) which only needs to be registered when the person loses capacity or a Lasting Power of Attorney which needs to be registered from the outset.
Your sister does not have to consult you with an application for an LPA in the same way that she would have had to do if she was registering an EPA. In my opinion the current registration procedure is flawed, for exactly that reason.
The fact that you may be older is irrelevant.
Your sister has no right to do anything with the will unless she has Power of Attorney over finance. Otherwise, neither of you actually have any right to see the will.
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
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