Honestly, it's a little on Alice, if not mostly on Alice. Even though she had her own definite reasons for not being able to leave the train, she hadn't wanted to bother the people who left the train with those, other than saying she just couldn't leave.

She just didn't want to throw her own problems on anyone else's shoulders, especially not as the last thing they'd remember from her.

"I realised that even if the train would fully let us go, I could never leave. There is nothing for me to go back to."

Not even 'no world', no, that's not even the problem.

It's 'no body', which is a much worse problem in Alice's opinion.