Melissa here is a good thread to understanding puppies. I don't mean this dis-respectful but I really don't think your little one has a different bark yet, she is just to young. Do not be surprised if she has accidents as at this age they don't even know what they are doing with they go the bathroom.
The ideal age to adopt a Yorkie puppy is 12 weeks and yours was only 6 weeks. Even though she was weaned off of her mom the mom dog teaches them many skills from 6 weeks to 12 weeks.
http://www.yorkietalk.com/forums/sho...t=puppy+stages