Even if there was a change within the family, it wouldn't fall on her.
You know, back when Avery Clark married into the family, she had a much higher status than Sofia Anderson. At that time, the Clark family was quite powerful in the west. She grew up under the care of her father and brothers, so she was spoiled and arrogant. But now, the Clark family is going downhill, and Sofia Anderson has the support of the Thomson Family. Henry Thomson and David Thomson control a large portion of the shares and connections of the Thomson Group. Moreover, this father and son duo are very obedient to Sofia.
In comparison, her husband, Alexander, was useless. He had a very carefree personality, which would have been fine if it wasn't for her and Henry having such harmony over the years. Unfortunately, Robert Thomson, who grew up under the care of his uncle and aunt, harbored resentment towards her. He didn't have the same respect and love for her as David had for his own mother.