I have searched a lot of dictionaries but still I can't understand the exact meaning of roguish in the text below.
"Ah, that's so, that's so!" Louisa said. "And what was it in my case but vanity, which deserves to get slapped down!" Her eyes were glassy and her expression roguish. "You don't think he'd had a good look at me any one time and thought the original was even worse than that poor picture, so he backed off?"
"casting away" by Alice Munro
Please tell me, What kind of a look is the writer trying to depict with "...and her expression roguish"?