After reading all your posts, I think she's just fine. You exercise her in the morning, she rests all day, then you exercise her at night. People do have to live, earn money, and just because they are gone from the house earning that living, that doesn't mean they shouldn't own a dog.
If anything, I would get a puppy pad, put a few together and put it by the back door. (They sell them at pet stores, supposed to have a scent on them that tells the dog they can urinate there.)
Also, does she have a command to "go"? Buddy's command is "hurry up." He'll be outside, playing and running, and as soon as I say, "hurry up", it's like a lightbulb goes off in his head, he stops what he's doing, runs to his potty area, and goes. lol! So maybe if you don't have a command, think about starting one. (Just every time she goes, say the same thing. She'll eventually connect the two.)
And I just want to reiterate what the last poster said. Don't run or exercise her on a full stomach, her stomach could twist. Walking is fine after eating.
Good luck!! And don't feel guilty. That dog is pampered and just fine.