DD 6 was fine all day. This afternoon we went for quite a long walk but she had a bag of popcorn while we walked round and a bottle of water. When we got back in the car she went very quiet and white and just kept saying she was tired and wanted to go to sleep. She was like this for around 30 mins then she had tea and perked up a bit but still quiet. She said she had felt shaky. Wwyd?