score:7
While not specific to Queen Keran's situation, this section from Medievel English Nunneries 1 may provide some clues.
Motives for taking the veil: a refuge for widows and occasionally for wives.
The occasional cases in which wives left their husbands to enter a convent were less likely to provoke discord. Such women as left husband and children to take the veil must have been moved by a very strong vocation for religion, or else by excessive weariness.
After fifteen or sixteen children (three pairs of twins!), who could fault Queen Keran for claiming excessive weariness?
It was necessary for a wife to obtain her husbandβs permission before she could take the veil, since her action entailed celibacy on his part also, during her lifetime. Sometimes a husband would endow his wife liberally on her entry into the house which she had selected.
1. Medieval English Nunneries c. 1275 to 1535 by Eileen Edna Power, Section 5b (Cambridge At The University Press, 1922)