Old Lady Hannah's family runs a shipping industry, and she herself, owing to her retirement and the fact that her children have done well in their work, now has a lot of leisure time and can pursue things she is interested in, like art.
In Europe, the trend of noblewomen hosting salons to welcome celebrities, scholars or artists is something that has persisted for hundreds of years. Many famous artists in history became well-known initially because they were recognized by these noblewomen.
Old Lady Hannah was no exception. As a wealthy and idle widow whose children and grandchildren were quite worry-free, she spent a considerable amount of her time hosting art salons.
Moreover, Old Lady Hannah's appreciation for art definitely reached expert level, and she had a keen sense for art and was generous when it came to investing.