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When you say you were legal guardian for your sister, do you mean that the court has appointed you as legal guardian?
You can do whatever she could do if she is mentally competent.
Here is a link to the information you need for doing a legal name change:https://www.servicealberta.ca/1490.cfm
When you go to the registry agent office you should bring all the information that proves you are the legal guardian as well.
Yes. You can.
This is not a name change for an adult.
You apply as if you were your sister, applying for the name change.
But then you sign your name as her legal guardian and you provide the documentation that proves it.