[Lush]

I think she wanted to die. Doesn't it say somewhere (quick! someone pull out a quote, 'cause I'm too lazy!) that Elves can die from grief, and the like, that they can basically will themselves to die if they want it so badly? And I think that Miriel's inability to find healing in Aman is just the first chain in the sequence of events that leads to the Silmarils, the kin-slaying, the wars, etc etc etc, ad nauseum. The sad story has to start somewhere. And so it starts with an Elf that is too weary to live.