Welcome to YT , you'll like it here!
If you purchased her and she told you that ( the breeder ) she may have lied as she does look like a Yorkie/Chi mix, I say this because of the way the forehead is and the eye spacing as well as the muzzle... she has LOTS of chi features... but her coloring and hair and ears look all Yorkie...
But like others said.. if you love the little girl and she loves you and makes you happy, who cares
she's adorable anyway and I am sure as sweet as can be!
I can brighten the pic for you and sharpen it up if you want...just let me know.