@MsLilly
The translation is wrong: the beginning of the chapter starts with "They've gone bankrupt" ," I suppose they've been a upright Holy Knight for all their lives" , "Even if it was a friend they shouldn't have lent them so much money" and "But who knew they were a swindler"
So we are meant to assume they, having been a honorable Holy Knight, naively trusted a 'friend' in a business venture and was left holding the bag after it failed.
Also, a young lady with two small kids, money and no adult is a great combination in the medieval times to get kidnapped, robbed, and either killed or turned into a sex slave.