User blog comment:FairyRaven/Fairy Tail Chapter 344: Wizards vs. Hunters, Review and Commentary/@comment-7418318-20130719174625/@comment-7418318-20130719204057

She talked about walking around the guild naked in one onsen and about calling the boys over in the other, she's constantly getting nakes for a second or two when she requips (though in the anime that is hidden by making her body glow bright) and she stormed out of the build building in just a towel and then threw that towel away before requiping into armor when Phantom Lord attacked.

Also she used to take showers together with Gray and Natsu and offered to do so again.

No I don't think she'd be concerned by beeing seen naked.