The contents of the strata roll are obtained by the secretary by the new owner submitting a notice on transfer of title.
The act says the roll contains the owners name (that includes multiple names if there are two or more owners), address (for services of notices) and any appointed agent.
However an agent can only be appointed by a corporation (who is the owner) or if the owner is a person and has some incapacity or does not read English. It does not seem your mother is incapacitated. If she cant read english, then there may be grounds to include you as an agent.
But all notices will then go to you. The act does not permit sending notices to multiple addresses.
It also means that the agent is the only one able to vote.