Straight answer

I had the most frustrating conversation with my daughter this morning.
Me: "Did you give that letter to Danielle?"
Her: "I can't remember"
Me: "Why not?"
Her: "I was dreaming about the letter and I can't remember what I did"
Me: "You were dreaming at school?"
Her: "No, this was in the night time"
Me: "You were supposed to give her the letter at school yesterday"
Her: "But I don't know what happened to the letter"
Me: "Well, do you still have the letter in your bag?"
Her: "No" Me: "So where is it?"
Her: "I gave it to Danielle"
At this point I have to try to resist the urge to strangle her ...