What I find interesting, vis-à-vis the discussions about language that pop up here periodically, especially the cast album v. soundtrack discussion, is that when we argue about the use of the term "soundtrack" to mean anything in the realm of soundtracks, cast albums, studio recordings, etc., we argue that the word is incorrect and its blanket use causes confusion, especially when there are multiple recordings of a single score. Thus the "soundtrack" to INTO THE WOODS could refer to any number of albums, unless one is actually using the term correctly.
But...the word that Laura Benanti made up to convey what she was feeling does exactly the opposite. It makes crystal clear where her thought process was and conveys exactly what she meant without confusion or misunderstanding. All that's required is a knowledge of the basic meaning of the root word "ingénue."
Making up words and/or arbitrarily changing usage is a two way street, apparently.