Board Thread:Destiny Forum/@comment-4814368-20140916164127/@comment-96.250.89.146-20150131182534

She obviously already tried to help Gaurdians, but her dark origins caused her to betray them. This meant that she had to betray them. If not, she would be killed. The ghost wanted her gone because she was obviously dangerous.

As for her friend, the Darkness spawned more of her. They are obviously fighting on the fringes of the Reef. They are seemingly cutting off reinforcements

~Phantom of the Wiki