Confront her
From Torg Adventure
"Well Grace, I can relieve your mind on one score. I think I've found what you're really looking for," you say, pulling the chain from your pocket and holding it up.
"Yes, that's it," she blurts out, then covers her mouth as she realises she's given herself away.
"I thought this might be yours," you say coldly. "A girl like you wouldn't be concerned about a few coins. But something like this might matter to you. Does it have a sentimental attachment, Grace?"
"Um, yes sir. My boyfriend gave it to me. May I have it back?"
"Not just yet," you tell her, putting it back in your pocket. "Come along with me and I'll show you where I found it." You gesture towards your cottage and her eyes widen further, her chin trembling slightly. "Come along Grace. I think it's important you see this."
She looks terrified, ready to bolt, and when you take her arm she jumps as if she's been electrocuted.
"Come with me Grace. Or we can go and see the Dean. It's your choice."
What does she choose? Come with you? Or go to the Dean?