The only time I can think of that the dark-haired girl (Julia) brings Winston a gift is in Part 2, Chapter 4. In that chapter, she brings him (for both of them, really) some real sugar (as opposed to saccharine). She also brings them a whole kilogram (2.2 pounds) of real coffee. Finally, she brings some real tea. She brings all of these at the same time. They have all come from the stuff that is available to the members of the Inner Party.
She also wears real silk stockings and has makeup that she has put on sometime before she comes to meet Winston.