No, I don’t have other children under 18. I am married but his father is not interested to get the PR.
Given the timeframe (i.e. it will take years and is quite uncertain), your own plans, and that it seems sponsoring your daughter is important to you and her brother: it seems to me the best measures you can take are to ensure your daughter gets the education and work experience that would allow her to qualify on her own to become a PR.
You might wish to consider higher education in Canada for her. While it's by no means a guarantee of eventually getting PR, university students can work in co-op programs, can usually work after graduation for a certain period (post-graduate work permit), and Canadian experience is a plus as well in eventually applying for PR on her own.