That we could find, anyway. The biggest mistake we made when we went to Italy was taking too many clothes and not taking ones that were more wrinkle free and lightweight. Mostly because we had to rinse stuff out in the hotel and hang on the balcony. sometimes they wouldn't dry. We never stayed in a hotel more than two nights so we didn't really have enough time to have the hotel send our clothes out for cleaning.
So, lightweight, little ironing - you are on the right track.
I have found that you can fit more in a suitcase if you are rolling clothes
But, she doesn't have to look frumpy when she does go out to dinner or on a tour. I think the skirt idea is great and she can even layer t-shirts. Or a jogging suit would be cool too for less formal.
Italy has gorgeous, high-fashioned people and I am guessing she doesn't want to look like a scmuck. : >
I actually only brought one pair of shoes that looked good for casual and dressy and they were extra comforable for walking - Ecco's. Don't think you have to go the burgenstock route
Hope she has a great time !!!