If your daughter separated in 2020, the Canada Revenue Agency (CRA) will still require her ex-spouse’s/ ex-partner’s information. The info is needed for a number of reasons, like eligibility for certain credits or deductions, handling property they still own together, etc. You would answer “Yes” to the question "Did you separate from your spouse/partner in 2020?", that appears after you select the “Separated” marital status.
If your daughter separated before 2020, you say "No" to the question "Did you separate from your spouse/partner in 2020?". Then you won’t need to provide any info about her ex-spouse/ ex-partner. This FAQ has instructions on how to change marital status if you have already passed that point: https://turbotax.community.intuit.ca/replies/3425400
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