Oh you don't have Canadian birth certificate. Sorry I assumed you do

just bcuz I have a canadian birth certificate. I think I just sent it as extra identity. If it doesn't ask for your birth certificate then don't worry about it.

The fact that you didn't send the supplementary form... is the reason it got sent back.
Don't forget to double check the issue date on birth certificate. To make sure it was not registered late. Again! if it was then send a copy of voter's id card and if she doesn't have it. Then maybe you can send a letter along with your application explaining why you don't have it..and attach Grade 10 certificate where her birth date is included.

There was a typo in my husband's address on the voter id card so I wrote that on the copy as a note and also sent his grade 10 certificate!!!