[ As calmly, but as straightforward and impartial as she can. Complex sibling relationships is something she is familiar with, after all. ]
By no means I truly know what had transpired between you two, but this is how I see things: you might be twins, but the both of you had been on the opposite sides of the battlefield for as long as you both can remember. She had been living with the memory of those she had lived with -- your enemies, Revive -- and she lives with them now.
As far as I can tell from what you have told me, I think she sees you, and Hiling as her enemies, up to now.
The pain of being betrayed and being lead to death is not something that easily healed and set aside.