Just make her feel little ashamed of it, by saying "oh you friend from next door was asking why you change so many dresses in a day...and when I told the reason ...he/she was making faces....."
Give a dose of social aloofness in house and no visits to park as she is wetting herself
Sorry, can't help...my dog knew enough to pee outside when she was three months old...are dogs smarter than kids???
My brother didn't stop wetting himself until the end of first grade