Chrysalis had been planning her revenge on the ponies ever since her defeat at the wedding of that wretched pink alicorn. It would have been the perfect day if it had gone the right way. Instead, she made the terrible mistake of underestimating that pink bitch. If things weren't bad enough, now she rules the crystal empire! Virtually, she had two enemies at the moment!
She needed allies, she needed more strength on her files. And she was getting desperate.
It wasn't really a surprise to see her trying to join forces with an stranger, who promises her to make ALL the female alicorn mere sex slaves, in exchange for a little help from her part.
The worst mistake of her life.