Good Morning!
And...
to YT!! If all checked out well I wouldn't worry too much about it. Like HHA said..I wouldn't be giving nutrical everyday unless she needs it. I have 2 yorkie girls. When I got Lillie (who is now 18months old) she would run and play like the wind and then just lay down where ever she was and sleep! She has a very different personality than Sadi (my 3 yr old). If I scold both of them for doing something bad, Sadie will just stand there and look and me and Lillie will cower like I hit her...I NEVER hit my girls! She isn't skiddish around people but, if she gets scared or starts with reverse sneezing she will run to me and bury her little face in my neck...she feels very safe in my arms..They are 2 totally different little girls but, I love them both for who they are.
I wouldn't worry too much unless she stops eating and drinking.