Your summary is a much better definition of ‘fridging’ than the one which appears on TV Tropes and should probably be added there, since TV Tropes is where I went to look up ‘fridging’ whereupon I was much puzzled by the accusations. But as the application of your definition deals with future events within HPMOR, rather than things which have already happened inside the story, I cannot comment further.
Your summary is a much better definition of ‘fridging’ than the one which appears on TV Tropes and should probably be added there, since TV Tropes is where I went to look up ‘fridging’ whereupon I was much puzzled by the accusations. But as the application of your definition deals with future events within HPMOR, rather than things which have already happened inside the story, I cannot comment further.
Now I’m optimistic that in some sense Hermione’s story is not yet complete :)