I fret over mine as well ...
anytime they sneeze or cough I'm thinking about calling the Vet
But I'd watch her
Not eating can be from a lot of things
and Yorkies are VERY finicky
The sleeping? My Puppies sleep away most of the day
If she is playing with you ... and running around I think she's ok
I'd continue to watch her
lol .. as far as her gravitating to you
They go to the one with the strongest spirit
They are VERY good at that
j