On account of the
anti-Catholic sentiment in England at the time, the sisters opted to join the Carmel in
Antwerp, Belgium. Following a dangerous and eventful journey via
Weymouth and
Le Havre, the two sisters, accompanied by their brother Edward, arrived in Antwerp on 10 August 1644 and were received by the prioress of the Antwerp Carmel, Ann of the Ascension. Both Margaret and Ursula were
invested on the
Feast of Saint Lawrence by the
Bishop of Antwerp, Gasper Nemius. At first, Margaret reportedly found the austerity of the order difficult and prayer challenging and often dull. She also developed doubts about the authenticity of her vocation shortly before her solemn profession, but describes a vision of Christ that put her mind at ease over the validity of her decision to join the order. She made her solemn profession on St Clare's day, 12 August 1645. During communion she reported having a vision of Mary "inspiring her to become her slave by voluntarily renouncing all satisfaction she might feel in anything she did". After four years in Antwerp, Mostyn and 11 other nuns left the Convent on 26 August 1648 and founded a new Carmel in the town of
Lierre. Margaret was unwilling to leave Antwerp at first, but was encouraged by a vision of Mary that told her "Lierre was the directed way for her to heaven". Following a short period in buildings belonging to the neighbouring Abbey of Bernadine Dames called "Nazareth", the community bought their own premises in Lierre and moved in during the summer of 1651. After a period serving as Mistress of Novices, Mostyn was elected as sub-prioress of the community in 1654, three years after the inauguration of the new foundation. A year later, at the third election after the beginning of the Foundation, she was unanimously elected as prioress. After the declaration of the result by the local bishop, it is reported that Margaret "humbly besought his lordship not to confirm the election, alleging many reasons, and want of abilities". As prioress, Mostyn gained a reputation for humility, never shirking any observance, and performing the lowliest of the jobs in the community. By explanation, Margaret noted that "it would be a strange thing to see a God become so little and humble and not to strive to imitate Him". Margaret remained as prioress of the Lierre community for 24 years until her death. She was succeeded by her sister, Ursula. == Visions and condolences ==