I for one do not understand what's going on here - if 'the wife and her dad is separated', then he should not have been able to land (unless they separated after he landed). If there's an issue, then the father's PR status may not be clear either.
If they indeed separated, then the wife may well have informed IRCC because she was obliged to do so. Same effect as sponsorship cancelled (which the dad's wife could do regardless).
On the other hand, if the father is now a PR and no issues (he became a pR before they separated), then in principle he should be able to sponsor his daughter on his own, as long as he has some employment to support her and she is under 22 years of age.
But still need to clarify what's going on. Regardless it's atrocious she was not informed of the issue beforehand.