Hi - Princess is just beautiful! Don't worry a bit about the color change. My black white & tan girl had color changes within the black just like you described. Perfectly normal. My white girl with fawn spots suddenly developed more fawn spots. In fact, I ran my hands through her white fur & saw fawn underneath. My newest puppy is turning blonder all the time. You are lucky that such a pretty girl came your way & she is just as lucky to have you!