I'm glad Sadie had a good first day alone.
FYI, the general rule for sleeping puppies is that they can hold it for one hour more than their age in months during the day, although that can be less for toy breeds with their tiny bladders. At seven weeks, she probably needs to pee every 2.5 hours or so.
Playing puppies are a different story. They sometimes need to go 15 minutes after the last time they pottied.