The Lost Clue by O.F. Walton

As time went on, in spite of her hard work, Marjorie began to feel not merely accustomed to the life at Colwyn House, but really fond of the people with whom she lived. Mrs. Holtby was very grateful for all that she had done for them, and was willing to fall in with any suggestion that she might make. Her health was gradually returning, and she was able to come downstairs, and to relieve Marjorie of several lighter duties.

As for Patty, she was Marjorie's firm ally and most willing helper, and Marjorie rejoiced when she saw the look of care departing from the child's face, as she realized that the burden of the family no longer rested upon her shoulders. The boys were at times exceedingly naughty and troublesome, but the little ones were devoted to "Miss Duggie" as they called her, and loved to sit on her knee listening to Bible stories, or to children's hymns which she sang to them. Their mother would often creep into the room and listen too; she told Marjorie that it made her think of her own mother, and of the lessons she had learnt long ago, but which, alas she feared that she had forgotten.