Aww ... Good luck with your new one
Yes, dogs do sometimes attach onto one person
if you want the kids to be more involved with her and her with them
Make them be the ones who feed her
also ... are you her protector?
If the children are very young and become rambunctious around her
the puppy may see you as her protector from them if you are the referee
and rightly so
The eating and playing with the poop
That's usually not a Yorkie thing ... but the pine apple is a good idea
also make sure she has toys to play with in her crate instead of her little turdlettes