We always fly into the port of departure a day early, so this gives us time to repack our bags if need be. But she is able to get it all into a carry-on and has done so on cruises in the past where we were cutting it tight.
If your carry-on is getting too large, then cut whatever are the least important items. Joanie is a small lady, so her clothes do not take as much space as someone of a larger size. The whole idea is to pack as much as you can to avoid the impact of lost luggage.