When you are asked an unexpected question, what do you do? Do you immediately answer like it's an instinct or appear surprised before processing what was happening? Finevis was facing the same issue.
On one hand, her mind immediately emptied itself. Soon, a flurry of questions bombarded her as she questioned why Ethera would ask such a thing. Unless, and truly shocking, she (Ethera) knew that she (Finevis) was reincarnated.
"Why," Finevis found her voice, "Do you ask?"
Avina gulped. She knew that she did something absolutely absurd. Although she never heard of the system rule to never reveal her true identity, she figures out that it was probably suggested. And now she was blowing her cover like a total bomb head she was.
"Nothing," Avina attempted to escape her terrible mistake. "It was nothing at all. I don't even know what I asked."