Westing game chapter 17 After reexamining their clues whom do Grace and Mr. Hoo think is involved in the mystery?

Grace and Mr. Hoo suspect that SyDELLe Pulaski, Mr. Hoo's new secretary, is involved in the mystery after reexamining their clues in Chapter 17 of the Westing Game. They believe she may have a connection to the bomber and the inheritance puzzle.