Foxy is adorable!! Congrats on your new baby!!
Also..it would not be a wise move to take her from her mom and littermates this early. Many yorkie puppies do not even have teeth at 7 weeks old. She should still have her momma's milk at this age...even if she is nibbling solid foods.
Many a young pups have suffered life threatning sugar drops just from the stress of leaving their mother much too early. Please tell the breeder to keep her at least another 4 weeks. 6 weeks would be better.