Why does Mrs. Bedlow have difficulty understanding why Lyddie was fired?

Mrs. Bedlow, Lyddie's landlady, is shocked when she learns about Lyddie being fired. Although she does not understand the full details of the events that led to Lyddie's dismissal, she is not convinced by the decision. She suspects that something must have been very wrong for Lyddie to get fired.
The reason for Mrs. Bedlow's reaction is that she knows Lyddie well. She has seen Lyddie overcome many obstacles in life just to achieve her career goals. According to Mrs. Bedlow, Lyddie is probably the best employee of the company. On many occasions, the she has witnessed the effort Lyddie invests in the company.
Before Lyddie lands the job at the mill, she has to overcome many obstacles. She has to deal with the separation of her parents, navigate the death of her mother, confront a bear, and struggle to educate herself. While working for the mill, Lyddie invests all her time in the company in her quest to make more money and be productive. Understanding the tough path that Lyddie has traveled to accomplish her dreams, Mrs. Bedlow is not convinced that the hardworking girl could do anything that would jeopardize her career.

Lyddie has bravely intervened on behalf of Brigid, who was about to be sexually assaulted by Mr. Marsden. Lyddie saves Brigid from Marsden's unwanted advances by attacking him with a fire bucket. Unfortunately, this lands Lyddie in hot water with Agent Graves. Marsden tells him that she's a trouble-maker. It's a complete lie, of course, but Graves chooses to believe Marsden, and Lyddie is fired as a result. Marsden has accused her of moral turpitude, an old-fashioned way of saying that someone's wicked or depraved. Lyddie's absolutely shocked and outraged when she finds out what the word "turpitude" actually means.
When Lyddie returns to the boarding house, she tells her landlady, Mrs. Bedlow, what's happened. Mrs. Bedlow is astonished at the news. She knows that Lyddie's always been one of the best workers at the factory, if not the best. Although Lyddie's landlady doesn't know the full details, there clearly must be something wrong if such a reliable hard worker like Lyddie has been let go.