I'm sorry, but you are not correct.
ALL OTHER VOYAGES 7 NIGHTS OR LONGER (effective Fall 2021):
90-76 days before commencing travel: an amount equal to deposit requirement;
75-61 days before commencing travel: 50% of gross fare;
60-31 days before commencing travel: 75% of gross fare;
30 days or less before commencing travel: 100% of gross fare.
Now, we know her cruise is late January so it's probably either 50% or 75% depending on date, so cancellation won't work in this case. But we didn't know that originally.