Abrielle listened to Cedric's suggestion and stayed indoors, not that she really did have anywhere to go. While she was staying indoors Evelyn took her around the castle while introducing her to house staff.
She was the lady of the house so it was her duty to manage the household. Luckily, the original Abrielle, being a noble daughter, was taught the affairs of a household as it was her duty.
She was introduced to the head maid, the butler and the house accountant. The house accountant was from a lower noble family. Lucas Ross was a character frequently mentioned in the book because he controlled the finances, which, of course, Abrielle wanted.
Unlike the original Abrielle, who had no interest in working, she just wanted to leave life and chase after Cedric. The current one has other plans for a simple reason: either she plans to run away when things get difficult or to kill her husband as originally planned.