[quote=@Gentlemanvaultboy]
I don't feel like the sisters would particularly enjoy Flonne's presence once they realized that she's not on board with the whole "suffering as virtue" thing they've got going on in Cvstodia. It's probably very confusing for them, faith wise. 
[/quote]

That's a good point, unless in their zeal they're able to justify healing as allowing them to suffer even more.

Maybe that would lead to Flonne being a fugitive in the place, trapped with nowhere else to go and constantly hiding out from the Sisters who seek to hunt her down and burn her.