They aren't friends. Rachel has made it very clear that she tolerates Elias at best, and only for the sake of their mutual friend, Reira. Rachel would have never thought she'd go back to Elias's side, when those early months of her first time in Ryslig were so blurry and distorted by a need for a god -- any god. And then he was replaced by someone else.

While she had aligned with the Fog out of an appreciation for her philosophy of being who you are even when it isn't pretty and because she likes living on the peninsula, when she had gone to one of her dear friends in search of a way to make someone pay for his pain, he'd only had one suggestion. He probably didn't think she would do anything about it.

And she didn't, for a while. Once Rachel had stopped being shadows, and her desire to seek revenge had died away, she was left with...a guilty feeling that tried to disguise itself as emptiness. She hadn't made any promises out loud, but in her heart... She had meant to do something for him. She had to, because she wants to. The things she wants to accomplish for his sake need someone else's help, and unfortunately she knows who the strongest ally she could make is. Her fingers hesitate over the keys before she starts typing at nothing.

Elias, if you could let me into the arcade, I'd like to talk to you.
I don't carry her key anymore.
...I'm not going to try to break anything, either.