Hi ya, How old is Princess? Have you just started walking her somewhere different - that might have a different ground surface? I think their paw pads are just like skin so it will grow back - but they toughen up because they're on the ground all the time. Do you put her in shoes when she's outside? Because if you do that it won't let the pads toughen up like they're supposed to. If you've had a cold snap and she's experiencing snow it might make a difference - It's summer here and I don't get snow even in winter so I don't know.
Dixie had quite soft paw pads and it took a while for her pads to toughen up. She even got a prickle! But she's fine now. I don't know if I have any real advice - I think I'm just waffling.