This is my favorite hairstyle for Josie(with or without the ribbon, though I'll give you the ribbon version here). First take her hair and divide evenly into two sections as if you were going to make pigtails. Then take one section of hair and tie it around the base of the pigtail leaving the ribbon to hang down as long as possible (ie: if you took the hair out there would be a loop at the far end of the ribbon, with the rest hanging free). Now braid, using 2 sections of hair and instead of a third section use the ribbon. Braid down as far as possible and tie off with a doll-safe elastic. Repeat for the other side.

At this point Josie should have 2 braids with the ribbon intertwined. Now take the braids and twist them together. Roll the twisted braids up from the bottom up towards her head (as if making a bun). I secure the chignon with tiny bobby pins I got off of ebay for dolls but I think other fasteners would work as well. Secure the bun and you're finished. It will look beautiful.