Ugh. She doesn't like being forced into anything, but she she supposes she can say this much.

Fine, if you need to know so badly.
It takes more and more effort for your soul to pull away from the Core.
Once things are in there it does not like to let them go. Your distance from it saves you, on your side of the glass.
Without interference your fifth deaths would be permanent. Your souls would burn into nothing in there.
So, for all your complaining, I'm doing you Real Things a service.

She could have just let him die in there, without any interference at all. Real Things can be so ungrateful.