What does Mrs. Marchmont realize shortly before her death in the novel, Villette?

Although she is sick and in pain, Mrs. Marchmont tries to be kind to Lucy and gives generously to the poor. The night before she dies, she tells Lucy that she realizes she has been selfish because while she has given to the poor, she has neglected many of those she can help, such as Lucy. She thinks that she should help those individuals whose lives she can improve, such as Lucy, and she promises to help Lucy but dies before she can fulfill her promise.