I agree, she is getting better, making small steps to not being All Annoying, All the Time. ;-) But when Elinor tells her of Edward's engagement "...Marianne listened with horror, and cried excessively. Elinor was to be the comforter of others in her own distresses, no less than in theirs..." Marianne should be comforting Elinor, it is her turn! But no. Poor Elinor.

But one time when Marianne's inability to keep her feelings to herself was really a good thing and allowed others to vent their feelings as well came after John Dashwood visited them to tell the news of Edward's disinheritance:

"Marianne's indignation burst forth as soon as he quitted the room; and as her vehemence made reserve impossible in Elinor, and unnecessary in Mrs. Jennings, they all joined in a very spirited critique upon the party."

I love this. ;-)