Commando = no undies. I've used the term for years even though it is probably more male-oriented.
Personally, I can't stand the string from a tampon. Horribly uncomfortable. Search this site for the whole huge long thread on the Diva Cup. The chamois will clean up durn well with a little Z'out stain remover.
And, yeah, tell her to sign up and ask these questions herself. We're silly but not crazy. Well, not all of us.

Make sure she knows you must be a pretty special guy to be asking these questions for her.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.