She's worn
worse...
She may not even be aware that that's considered a "bad" word. Have you ever been to
Engrish.com? No one on that site is really aware that what's written on their shirt is considered funny (or in the Adult Enrish section) dirty, they don't know what it says.
Plenty of people over here were clothes with Chinese writing on them, and they have no idea what they say. You could be walking around with the Chinese words for "Cheap ****" on your chest and you'd have no idea untill you saw some one pointing at you and laughing for no other reason, or some one came up to you and asked for a pictures, and if you minded being featured on their version of Engrish.