"You?" "Well, I can't take all the credit for your MOTHER'S death, but yes. I planned it out, and I lead the patrol." "But-..but.." Echopaw's heart sank back to her chest. The only BloodClan cat she ever trusted had betrayed her. She'd killed Quailwing. Jade looked back at her, she emerald green eyes glittering with satisfaction. Memories swirled before her eyes. Her father, Miststone, struck down by the dark brown tom, the sickening smile that was plastered on her face as he went on to rip the lifeless eyes out of its sockets. Her mother's warning about BloodClan. The first time she met Jade, and the times they spent together. Her mother had warned her, if only she listened. "I thought we were friends..." she squeaked, as Jade and her patrol turned away. She heard her cackle. "Don't you know, Echopaw? BloodClan cats don't have friends!"
My 'headcanon' to Echostorm's evilness (XD) even though we made the story. Basically, Jade was forced to kill Quailwing, her mother, so she wouldn't be banished (and probably killed by her father) and Echopaw found out. So ya. She saw Jade in Silverlight, and made it her goal to get them out of the Clan before they could cause any harm.