But, (and, Chopincat, correct me if I'm wrong) our friend doesn't aim to play the entire set right now, does she?
There does seem to be some relationship between the etudes and their order, but since there isn't any clear evidence that has been presented, the order could've just as easily been artistic. Or, (though I highly doubt this one) just the order he wrote them.
One doesn't need to play the Chopin etudes in order to get a lot out of them- studying any etude, even (and some especially) the slower ones (10/6, 25/7, much of 10/3), just as you don't need to study the Liszt Paganini etudes to get something out of them.
I am curious though, to see why he wrote them in the order he did, or if there is more value to doing it that way- perhaps it could make this thread different than the dozen other threads of the Chopin etudes!