Even if you don't have someone come in to let her out, giving her free roam of a large area is a bad idea. When she potties, she'll think that's OK to do wherever she happens to be. At minimum, I would start gating her into a small, easily cleaned area (like a kitchen) that you can thoroughly puppy-proof. Then I'd ditch the puppy pads and plan to thoroughly clean the tile/lineo, etc, with enzymatic cleaner. Containing her also means when you are home, she's more likely to go in that one room, which is preferable to having to train her out of using the house as a toilet.
Beyond her not using them, if she decides it'd be fun to eat the puppy pads, you could be looking at dangerous blockage.