If you are only feeding her once a day she could be having a hypoglycemic seizure in her sleep causing her to wet or poo . You need to contact your vet about this, I guarantee he/she will tell you that pup needs to eat at least 3 times a day. C'mon now would you feed your kids only once a day ? I think not. Why ? they are growing fast and must have nutrients to maintain health and survive. No dog should be fed only once a day as it causes MaNy health issues, Bloat and or starvation are the top 2. I imagine your puppies heart is broken now that her Mama has a new human baby and she's not the baby anymore