She is adorable. I don't know much about Partis, but I do know my younger Yorkie's saddle area was thinner at 8 months. It all comes down to an individual pup's genetics, so there are no rules that you can rely on. The best you can do is look at pictures of the parents, and ideally previous generations.
As for size, that is another matter of genetics. My boys are brothers and their lines have late growth spurts. Teddy was slightly under 6 pounds at 8 months, and he is now 9 pounds full grown (developed a lot of muscle his second year).
__________________ Kristin, Max and Teddy
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