What are three ways in which Helen's situation when she comes to Holmes is similar to Julias just before death?

Helen is in a similar position as Julia was in several ways.

They are sisters.

They are or were living with Dr. Roylett.

They fear what was about to happen (or, in the case of the dead sister, what did happen).

They heard a mysterious whistling in the night.

They sleep in a room with a false bell rope.