Yes, for your Mom, the passport will be the only supporting document which will be required + 2 photos (with details at the back of photo).Good day,
I am just preparing ................
Thank you for all your help!
And from your end, your Canadian Passport or Citizenship Certificate or PR card (as applicable), your marriage certificate (if you have a co-sponsor/ spouse), birth certificate.
Before you submit the application, I suggest to go through the application guide 5772 and then check the application forms again and again to ensure there is no mistake, I noticed that lots of Sponsors sent their application in rush and after the application was gone they realized about the mistakes in application.
Good Luck!