That was not my take at all. The unwritten part of her statement was "I am not, can not even, talk to you right now, bc I am so upset, but when I cool down, I am going to have SO MANY words to say to you!"
i.e. as night follows day and death follows life (and taxes follows birth:-), these words were always fated to be coming - but not yet, later... - until later came and then the torrent was released.:-)
Words unspoken speak that speech is not spoken until spoke.
So the only way i can decipher this is that there are "unspoken words" (written words) that "speak" (declare) "that speech is not spoken until spoke" (that speech is only speech when spoken)
Is that how it was intended? English is not my first language so this just looked like gibberish to me at first.