When Slade offered to teach her, she thought that she had finally found someone who wouldn't betray or lie to her, someone who understood that she needed help.
She thought she was so lucky the day she ran from Titan's Tower, and found him waiting for her onshore. He had offered her control, escape from this curse that was supposedly so wonderful, something she didn't want anymore...
And when working for him and training with him got difficult, and she thought that she should've stayed at the Tower; all she had to do was remember what Beast Boy had done…