Extreme accent

Sophie seems to have picked up quite the accent somewhere. It seems excessively Canadian, or even Scottish in some way. It's only with certain words though, words with the "ow" sound in them, like couch. She pronounces it "oo", like "cooch". I had only noticed this in passing until one day when she really drew attention to it while sitting in her highchair after a meal: "Soophie doown, want to boonce on the cooch!"