Everything seems perfectly fine to me! I would look on the bag of Nutro and feed whatever is recommended on the bag for her weight. I free feed my 2 yorkies...I leave food down all day for them so they can eat whenever they want to. I have 2 yorkies and they share a food bowl. I fill it up every morning with 1/2 cup of dried food and it is usually all gone by bedtime at 10 CST. My 2 yorkies both poop twice a day. But since your little one is still very young, I would not worry about her popping 4 times a day. And all yorkies are different.
CoNgRaTuLaTiOnS on your new addition.

And Welcome to YorkieTalk!

We look forward to seeing more of you around here and seeing pictures of your new furbaby!