I see a lot of back and forth here "avoiding" the N-600. Remember, ***she is a citizen*** when you get sworn in if she's under 18 at the time. The N-600 is just getting specific proof for her of that. She doesn't need it right away. She can just get a passport. If you're concerned about losing documents, she can get a REAL ID and a Passport card as well and then has 3 documents that show citizenship status. She can put the passport card in a safety deposit box. The N-600 can be filed now, in 5 years, in 10 years; she is a citizen, the N-600 doesn't grant citizenship, it just a very, very, very nice to have.
Please don't try and schedule things so she gets her own N-400 and then has to wait for her own process there as well, needlessly, and separately (even if unlikely) risks a denial.
Also, if you want to be annoyed, the Canadian citizenship certificate application is $75 CAD ($54 USD at today's exchange rate).