Sina notices Beleth's sudden tension, and also her choice to leave Cyril out of it, but she decides not to ask. In truth, she has a hard time seeing why one would be qualified over the other, since neither is First or even a mage, but she's known Beleth long enough to be careful with what she says. She knows better.
"I suppose," she says easily, beginning to refine an antler with the tips of her fingers, "...though I would hesitate to offer our clans as assistance without having consulted them first. The Inquisition isn't their primary concern, and..." She glances about briefly. "...never should be, if I'm being forthright." Her clan is tied to it through her, and she understands and accepts the need for her to serve the Inquisition in exchange for help with her shard. But if it hadn't been for that? Dahlasanor still wouldn't be on the map, and they'd be more than fine with that.