Hi,my new mom did this also ,and with the father of the puppies.This is very normal.it is a very protecaive mom.In time she will be back to mormal.What she need is not a lot of people around her.If this is her first litter she will be very protective of them.also I as a breeder i do not give any meds natural to my new moms do to the fact they have it going throught there body and the milk that the puppies drink.give her time and she will be your girl again,,hope all goes well.HAPPY BIRTHDAY LITTLE ONES