If you're going to be gone longer than about 2 hours at your pup's current age, a space where she can potty in one spot and sleep/eat/drink/play elsewhere is best - if she has to sleep where she potties she'll learn to eliminate where she is because she has no way to move away and that will make housetraining/crate training much more difficult.
The larger area could be a puppy playpen or a puppy proofed bathroom and should be at least twice the size of her crate, ideally a bit larger to provide plenty of room to move away from any eliminations. Use paper or puppy pads - several layers would be best since many pups will move the substrate around - start with the whole floor space covered and then once you know where s/he is going you can consider slowly removing pads/papers from the areas that are kept clean.