"......in her shoes, looking back at the blackmail....I think she beats herself up over it in private for having gotten caught. By someone who wanted to go after her."

There is no way in hell that Beauford is going to tell Dinah that her mother KNOWS about Milliways. But there's nothing saying that he can't get Dinah to thinking about talking about it with her mother.

"She just wants you to learn to be careful with what you say or do about certain things."