Sometimes when a person is born dark skinned, you cant alter ur skin color to be more fairer.. I have olive skin tone. I stay away from the sun, wears highest sun block but I still dont get fair a lot. It's in my gene. Try to see the color of ur girlfriend's thigh. If that part is fairer then I think she could try some products to achieve that tone.

Anyway, skin bleaching is NOT a solution. Please see Lil Kim, she has awesome chocolate tone that glows and but now she is lighter which didnt suit her. Michael Jackson didnt bleach his skin this statement always get on my nerves.