After Annamaria is scratched she throws an amazing fit both Miss Dashwoods feel is not equal to the injury and she keeps throwing it because of the attention she receives from the Miss Steeles and her mother:
"Poor little creature!" said Miss Steele, as soon as they were gone. "It might have been a very sad accident."
"Yet I hardly know how," cried Marianne, "unless it had been under totally different circumstances. But this is the usual way of heightening alarm, where there is nothing to be alarmed at in reality." (Ch. 21)
Marianne has no inkling she has just about described her over-the-top reaction to Willoughby’s departure. The only difference IMO is Marianne feeds her sorrow not for attention and sugar-plums but because she feels it is the right way to express her sadness. (:D)