Lady Cottington is a collector of faeries, she finds them and presses them in her book, as one would with flowers or butterflies. When she came across Fenn she thought, "How delightful, this one has horns, I wonder if they will make that satifying crunch sound that snail shells make."
However when the Lady tried to press Fenn there was no crunch sound but a low snap as one of her horns broke under the weight. Flustered, Lady Cottington walked away in a huff looking for something heavier to press with, mean while Fenn made her escape.