I am no fan of rolling totes. You get a rather slim selection of bags and the wheel and handle system steals valuable space and adds weight.
If a tote sized bag is her preference then better to get the $30 Samsonite luggage trolley:
http://www.amazon.com/Samsonite-Lugg.../dp/B004WYD9NK
Then she can have her choice with any bag that fits the size requirement and just carry it in that luggage trolley. Another advantage of that system is that it is also possible to squeeze in a duty free shopping bag in case she does any shopping at the airport. Once you get on board the plane just collapse it all and put the trolley in the overhead and put the bag under the seat in front of her.