Yes. Your friend can make a legal document that gives another person
authority to act for her in respect of property and other assets.
In most provinces such a document is called a Power of Attorney.
In Quebec, it is called a Mandate Given in Anticipation of Incapacity.
A power of attorney can be made at any time to give another person
authority to act for you. If the power of attorney, however, is
to last beyond a time when the maker of the document becomes incapable
of making her or his own decisions, the document must explicitly
state that fact. For example, if the power of attorney does not
state that it will be effective at a time when your friend becomes
incapable of making her own decisions, the document will become
void at that time. In some provinces, powers of attorney will also
become void when another decision-making authority is empowered
under another law, such as mental health law.
A power of attorney that comes into effect on the incapacity of
the maker of the document is sometimes called an Enduring
Power of Attorney, or a Springing Power of Attorney.