Does the questioner believe that the lack of blessing in his money is a result of his disobedience to his mother, especially with the material losses he faces and his feeling of his mother's reproach towards him, or is it a trial from Allah?

The question does not indicate any disobedience towards the mother. One should visit her and the maternal aunts as much as possible. Financial losses may be a trial, and not necessarily due to a sin. The mother's disclosure of secrets is prohibited, and it is permissible to keep secrets from her to help in the fulfillment of needs, especially since "every possessor of a blessing is envied." The mother's reproaches are natural, and one should treat her kindly, gently, and with benevolence, as well as the maternal aunts, as much as possible.