Yes, there's an area for guests.
Your daughter can either stay with her mother or with you if she's present.
But if you bring her along, why not let her sit with fellow new citizens. She is not required to pronouce the oath of citizenship, but will have a flag and some goodies
During my ceremony, the citizenship judge called all the kids that were becoming canadians to come join him upfront to sing the national anthem. Quite funny, she may love it ^^