I'm fairly certain that you can't represent anyone else if you haven't been called to the bar, but there are some things that you are allowed to do (from the National Self-Represented Litigants Program):
- You can help prepare her case before it gets to trial. There are plenty of resources that you can use, and it may be helpful to get the services of a lawyer for specific issues if you need to ("unbundled services").
- You can apply to be a McKenzie Friend, to help manage documents and take notes. Check with the court to see if this is available.
I am not a lawyer, but this is an area that is of interest to me. However, check with a lawyer and the court if you have specific questions, because different courts have different procedures that you need to follow, and they can assist you with getting the correct documents to file and timelines to abide by (court staff can't give legal advice!)