Question about adding minor child to citizenship application (IRCC guidance unclear)

Hi everyone, hoping someone can help clarify this.

I recently submitted my Canadian citizenship application (adult PR). My 5-year-old daughter is also a Canadian permanent resident with about 2 years of PR time. I didn’t include her in my application at the time.

I reviewed IRCC’s official guidance for minors here:
https://www.canada.ca/en/immigration-refugees-citizenship/services/canadian-citizenship/adult-minor/who.html#requirements-minor-5_1

From what I understand, a minor applying separately under 5(1) needs to meet the 1,095-day physical-presence requirement, including at least 730 days as PR.

When I called IRCC, the agent told me I could “send an additional letter of explanation” to request adding my daughter, but they didn’t clearly confirm whether this is actually allowed after submission.

So my questions are:

1. Has anyone successfully added a minor child to an already-submitted citizenship application?
2. If not possible, is submitting a separate minor (5(1)) application the only option?
3. Does IRCC ever link or coordinate ceremonies if the child applies separately?

Any experience or confirmation from others who have gone through this would be appreciated.

Thanks in advance!