She does. She knows that she's blessed with people who care so deeply about her, but that's exactly why she's afraid. She wants to be selfish, stay for only the good times and leave when it gets too hard. Everything eventually comes to an end and before her family and friends comes to that finality, she'd leave first.

[ Just like Kido said, Rei may want that but not in this way. However, this is the only way that Niko can see. ]

She had to see that end once. Do you recall the goodbye that you had with her? The time that your memories were wiped of her existence?