Final answer:
Sophie installed a water-flushing toilet in the church bathroom in Galvaldon, which was an innovative improvement in terms of sanitation and comfort during the Romanesque period.
Step-by-step explanation:
Sophie had installed a water-flushing toilet in the church bathroom in Galvaldon. According to historical references, during the Romanesque period, separate rooms with walls around them were used as chapels. However, Sophie's idea was to open up the space and allow light to flood in. This installation would have been a significant improvement in terms of sanitation and comfort for the churchgoers.