A week has passed, since Astral had felt the pain residing within the bottomless darkness inside Lily's heart. Ever since then, she had been overtaken by the feeling of trying reaching out to Lily, but always stopping herself.
Because first she wasn't that close to Lily, second Luna was there, third she also felt through their bond, she was fine. It was just that the lingering effects of that gut wrenching pain were still felt.
Even though she wanted to go, she chose not to instead she focused on what she must do here, to explore, learn, and adapt, so that when she meets up with Lily again, they can spend time together, doing all the mundane things human's like to do. And finally become close enough for her to not find reasons not to immediately go after Lily.
Yes, I'm aware that psychopathy is a mental chronic disorder. (and does not mean a person is a danger to society, if they choose not to) but it sounded better that saying serial killer.