What Does Elinor Ask Marianne

Elinor is asking Marianne not to show her emotions. She is saying that Marianne is causing everyone else to suffer. In the previous line where they call it unrested grief, this means that Marianne is not even trying to calm down or stop crying. She is almost enjoying being the center of attention in the family and the bother she is causing them.
At the end Marianne is saying that as happy as Elinor should be, she has no idea how much Marianne suffers. Again she is trying to be a Drama Queen.