Therese used one of her few vacation days to meet with Claire.
While being cross-examined, it seems she indirectly admitted to using her subordinates to deceive Gisu and kidnap Zenith.
Thus, she is definitely confining Zenith somewhere.
"However, as I expected mother seemed a little off... it's like she's hiding something, or is conflicted. I don't think she's seriously considering marrying Zenith off, but..."
"I see... so, where is she being confined?"
"Sorry, I couldn't get that out of her.