After Astoria Greengrass became Astoria Malfoy, she realized that the biggest challenge in her career as Mrs. Malfoy was not the endless balls and endless interactions with the ladies of various families, not her mother-in-law and father-in-law, not the kitchen and garden, not the house elves and white peacocks, but her husband Draco Malfoy.
After Draco Malfoy accepted this irresistible marriage, he discovered that his wife was not as well-behaved and boring as she appeared to be. He believed that she could turn Malfoy Manor upside down if she wanted to.