My SIL used a PnP for my neice and it was fairly new, the sheet was a PnP sheet and freshly laundered.
She also brought her own PnP sheets just to help DN feel more familiar.
If you don't like the condition of the PnP you can likely request a newer one. The have one in every room, or at least every room I have stayed in. It shouldn't be too hard for housekeeping to switch them out for a different, newer one that isn't being used.
TJ