Tucker weighed that at 12 weeks and at almost 5 months old he is 5 pounds already, he came from 4 pound parents... I would say that she is at a normal size right now however only time will tell as to how big she will actually be as an adult.
The parents and the puppy charts can give you an "estimate" but I wouldnt count on them, they also say that you can double thier 12 week weight by 2 and that will be how big they will be so as an adult she will be around 5.6 pounds.. but like I said Tucker was that weight and he is already 5 pounds and Im pretty sure he isnt done growing..
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