Lilia was playing nicely in her room with some stickers. She was having trouble getting them off the page. I walked into the room and she handed me the sticker sheet and said, "Mommy, I'm frustrated!"
I know I have used that phrase to help her describe her emotions, but I'm not 100% sure she knows what it means. However, she did use it in the right context. It gave Dave and I a good laugh!