Beleth almost laughs at Klaus' far too accurate assumption, almost says something like 'you have no idea', or something similar. After a moment of thought, she settles for looking him dead in the eye and simply says, "Yes."

It should convey her sentiments appropriately.

"We have people looking into the rifts. I'm pretty sure all we know for sure is how to close them. That is--you just wave your hand with the shard in it at the rift." She raises her left hand, and wiggles it a little. "It'll close the rift up, and no more demons. But we haven't quite figured out how to stop them from opening."

Which is. A pretty serious issue, admittedly. But she's sure the rift and veil project is doing the best they can.