The duke added, this time his words were spoken more slowly, to emphasize his intent, "However, if you want to do any work because you are bored and need something to do, you can do bookkeeping or whatever."
At that, Sophie felt at a loss for words. She wanted to ask what he meant by his statement, but she was too shy to speak for fear she misunderstood him.
Perhaps, he meant to say that he would be responsible for her livelihood, together with her child, and that she didn't need to worry about her needs.
He didn't really mean to say that his money was her money now, did he? It was too absurd.
She was just his wife in name, a trophy even, to bring out to social events that required him to bring a partner. Even a full wife usually didn't have entitlement over their husband's wealth.