Philippa acted as regent in 1346, when her husband was away from his kingdom, and she often accompanied him on his expeditions to Scotland, France, and Flanders.
Philippa bertindak sebagai Wali penguasa pada tahun 1346, ketika suaminya berada jauh dari kerajaannya, dan ia kerap menemani suaminya dalam ekspedisinya ke Skotlandia, Prancis, dan Flandria.