I Got All Intrigued for Nothing

The brunette twin is the ultimate eavesdropper. If she's on the same floor as us when we talk she always seems to hear us and ask a follow-up question. She has to know exactly what we're talking about at all times. I keep telling her she doesn't need to know about every conversation, but she doesn't listen. She's sure we're having a fascinating grown-up conversation.
This morning I was on the phone with Daddy when I said, "They don't even know it's down there." 
The brunette twin was sitting right next to me at the dining room table. She was supposed to be eating breakfast, but she was just staring at me. I kept talking to Daddy while she waited impatiently for me to hang up. Knowing that she was anxious to ask me about my phone conversation I kept talking to Daddy.
As soon as I hung up she said, "We don't know what's down there?"
I said, "It is not your conversation, don't worry about it."
The brunette twin started begging to know what we meant and pleading with me to tell her.
I sighed and said, "We were talking about the hot water tank and why we don't have good water pressure in the bathroom."
Her face fell. She said, "I got all intrigued for nothing? That's not right."
I told her to stop listening to my conversations and she wouldn't be so disappointed. It's not going to happen, but maybe she'll think twice before interrogating me about every conversation.