Diana, I finally managed to find a different walkthrough, which gives a lot more detail. Only problem is--it's in Spanish!!!
Anyway, basically here is what it says: first place the piece that looks like a skirt, next the one that has a navel (I guess this must be a bare waisted girl!). After that, the part that contains (how shall I say this?) her most outstanding charms.....
After that, place the narrowest piece, which is the neck, and then the one with the mouth (with only two teeth--am I reading this right?) Last of all goes the face, which you can tell because of the half-closed eyes.
I hope this helps you get past this part.......