QLD Enduring Power of Attorney - Protect Mum's Belongings with a Will?

I note your comment that your mother does not hold any or little assets.

Does your mum have any superannuation?

If yes, ensure she provides her superannuation fund with a "binding beneficiary" nomination. Whoever witnesses the binding nomination, ensure they provide a statement to confirm that your mother was in the right state of mind when she signed the nomination. Otherwise parties may object to the nomination on the basis that your mother was too sick and not in the right state of mind when she made the nomination.

A binding nomination will avoid superannuation complications.

Just by way of reference, if she updates her Will and states in the Will how her super is to be distributed, this is non-binding in terms of super as it is not an Asset.