16. How does Lady Blakeney say her husband acts towards her when they are alone together

This depends what chapter you are referring to but I think generally she found him useless and she felt without hope:

Her nerves were in a state of painful tension, which had increased a hundredfold during that brief hour which she had spent in her husband's company, between the opera and the ball. The short ray of hope—that she might find in this good-natured, lazy individual a valuable friend and adviser—had vanished as quickly as it had come, the moment she found herself alone with him. Ch 12