She is mentioned a couple of times during her childhood: in 1403, she was present at her widowed father's wedding to Joan of Navarre, and the same year, she made a pilgrimage to Canterbury.

In 1405, however, a Scandinavian embassy composed of two envoys from each of the three Nordic kingdoms arrived in England, and the marriage between Philippa and Eric was proclaimed.

On 26 November 1405, Philippa was married to Eric by proxy in Westminster, with the Swedish nobleman Ture Bengtsson Bielke as the stand-in for the groom, and on 8 December, she was formally proclaimed Queen of Denmark, Norway and Sweden in the presence of the Nordic ambassadors.

[4] Philippa left England from Lynn in August 1406 with an entourage of male and female English nobles and arrived in Helsingborg in September, where she was greeted by Eric and Queen Margaret.

The festivities lasted until November, during which several men were knighted and Philippa's dowry was officially received by the court chamberlain and clerics from the three kingdoms.

Philippa was in turn granted dower lands in all three kingdoms: Närke and Örebro in Sweden, Fyn with Odense and Nasbyhoved in Denmark, and Romerike in Norway.

[4] Queen Philippa and King Eric lived in Kalmar Castle in Sweden with their court the first three years of their marriage.

[4] From 1409 onward, and particularly after the death of Queen Margaret in 1412, when Eric became King de facto, the royal couple mainly resided in Denmark.

By the Pomeranian Act of Succession of 1416, Eric named his cousin Bogusław IX of Pomerania as heir to the three Kingdoms if his marriage to Philippa remained childless.

[4] At this visit, she also acquired additional Swedish estates to support her future in Sweden, where she evidently planned to retire as a widow.

In 1428, Philippa successfully organized the defense of the Danish capital against the attack of the Hanseatic League during the 1428 bombardment of Copenhagen.