If you're going to feed raw, you're going to need to accept that poos will be a bit abnormal for the first three weeks or so. It's a BIG change on their system. And mixing it with kibble isn't going to help aid the digestion . It's totally normal to see runny poo, mucus poo, and different poos the first three weeks... and probably longer if you're mixing raw/kibble. Just try to stay calm and know that the raw isn't going to hurt them.
yes, you are right, mixing it isn't a good idea.. so far she hasn't been runny and that is a good thing.