She had watched that unfolding like her life depended on it, even though she would never admit to such a thing. In the end, she reacted more to the kiss to her temple than to any real understanding of what he'd said or any recognition of the words (gibberish) on the paper.
Her reaction was purely an emotional one, unfortunately, that came with a flood tears that she couldn't stop, even as she laughed through them deliriously.