She will need to learn from her own experience.
When you pack to go HOME...

, leave behind all that you didn't use. That way, you won't take it again. ( if you use it all, you spent too much time changing clothes )
My suitcases for our first 'One' week were 2 large, 2 carry on.
Now, for more than 3 weeks, one mid size, 2 small carry ons. Mid size is for a few clothes, snackies and giveaways
They do your laudry, not you
