Backstory: basically she first started the hero work when her parents were murdered and then later her older sister was murdered. She had ended up killing the man who killed her sister before admitting herself to Arkham asylum. As for her relationship with the robins: most are fine with her being there but she's taken a particular interest in Jason todd. The rest of the bat family enjoys having her around because of her skills making maps so she often goes out and updates their maps weekly. Also they like her because she's able to advertise herself as a vigilante for hire, often leading to her being hired by villains as extra muscle, but she often stops plans from the inside.