Do not worry! Here is what I would do. Set up a x-pen or your laundry room as a little room for your baby, with pee pads on one end. Doggies have a natural urge to not dirty their room and they will use the papers once they figure it out. Put away all things that are no-no's so they cannot reach them. Set a little TV or radio in there and put the volume on low or whatever to cover up outside noises, so they are not scared of things they hear outside, like the garbage truck. Put some toys in there. They do indeed SLEEP most of the day. Doggies are most alert early in the morning and at night. Make it a comfortable place for your baby to sleep and most of the battle is already won.
Believe it or not, they do indeed LIKE to be alone.
You will smothered in puppy kisses when you come home because she will smell you! You may even hear her barking excitedly when you open the door, but this is not because she was lonely and barked all day. It is because she smelled you coming.
Hope this helps! Don't worry!