Sophia is young, so you might be battling the puppy hair, which tends to tangle more easily.
I have had great success bathing with Biogroom Oatmeal shampoo and Biogroom Silk Creme conditioner, then brushing through with this brush:
Amazon.com: Isinis Hair Brush * Made In France:...
Most Yorkies here love bully sticks, especially the ones sold by YT member AMD.