Your puppy is cute.
I have always used the rule between 8 -10 weeks double thier weight.
She looks like a yorkie.
Some people think yorkies are 3 lb dogs.
They come in all different sizes, even up to 14lbs.
Remember Yorkies were breed by several breeds to get there distinctive look.
Some of the breeds were larger terriers than they are now.
So there are what people call kick backs, some of the genes regress to a terrier in which created the Yorkie breed. Sometimes you see white on a yorkie, that is the maltese that is in the genes. Just an example.
There are 3 types of dogs, this goes for yorkies too.
There are Show dogs, mainly standard rules, restricted diet.
There is what they call a pet dog (family dog), another type of diet, the spoiling kind.
Then there is the breeding dog, a special diet for puppy breeding.
Now the show dog, is the tiny one everyone wants, and most of the time people think that is what they are purchasing. Unfortunately that doesn't turn out that way.
Sorry to ramble onn, there is all kinds of info on the internet.
Good luck