I was insistent on teaching her good scientific technique, though, so I told her she had to label them anyway. (The voice of Adam from Mythbusters is always in my head when I'm sciencing.)
I saw Reese cutting out some paper with a scowl on her face after suggesting sticky notes, but being informed that they "flip up" and are therefore impossible to use.
But later I went to check on the project only to find zero labels, I called out to Reese: "I thought I asked you to label your experiments!"
"I did!" She called back.
I checked 350 degrees around the tests, and even scanned the rest of the counter to make sure I wasn't missing something. Nope. "What are you talking about?!" I called to her again. She came into the kitchen to show me.
Okay, Ms. Passive-Aggressive!