She took this trip in about 1417, when she was approximately 44 and Henry V was on the throne in England. This trip would have taken place about two years after Agincourt when Henry was preparing to invade France in the later stages of the Hundred Years War. Margery mentions how difficult it was to secure a ship because most available boats were being used elsewhere. So she did not want to walk through territory that was a battlefield but the route along the northern coast of Spain was clear as there was relative peace at that time.
Her pilgrimage to Rome and Jerusalem took place before this and she went to Jerusalem through Germany and probably came back that way as she returned in about 1415 and one would not want to be an Englishwoman having a stroll through France while the English are attacking.
About this time, another woman who was famous for hearing voices was born - Joan of Arc. The fact that one of the reasons that Joan was accused of heresy was her insistence on wearing men's clothing shows how dangerous it was for Margery to wear white although she had been forbidden to repeatedly. At Joan's trial, she insisted that she wore men's clothing to preserve her chastity, a reason that was permissible under canon law but Joan was being tried by the English factions and logic would not save her.
Margery lived another twelve years, perhaps more, after Joan died. It is interesting to note that Joan's brief life fell within Margery's. If Joan was born in 1412, then she was only 19 when she died in 1431. Margery did not mention her at all in her biography. It is a shame. If they understood each other's language, they would have had much to say to one another. Since they were both on speaking terms with Jesus, surely he would have sat down with them and translated.