@Sanjay: I take the word to mean, in this case, a hair curler. It might also be a rolling pin but I don't think the girl would dance with a rolling pin in her hand -though I admit that going to dance still having a curler in one's hair is also weird but we don't know where the whole thing happens. No other meaning of "rouleau"/"roller" fits and I couldn't find any special meaning of the word in any Cajun online dictionary.