Most yorkies get this "gunk" in the corners of the eyes,its nothing to worry about but it is anoying as it makes them look unclean.I get rid of them by dampening the "gunk" with a cotton ball soaked it warm water,then I comb them out with a flea comb.It works wonderfully and makes them look fresh and clean again

About the poop,could your baby be eating her poop whilst you are away? This would be completely normal if she is and would expain why your puppy doesnt seem to be pooping all day.Pups poop alot whilst the are young,Id say 2 to 3 times a day so it could be that the poop is being eaten and not that she is not pooping