How old is Kandice? Sometimes they get so tired they end up with a headache and other times they are in pain elsewhere but describe as headache. My youngest always has a headache in her tummy.
Also may be an idea to get her eyes tested as if she has been straining them throughout the day that will cause headache. I get headache if I eat too much chocolate so it could also be food related? Just a thought.
Glad to hear she's feeling better today.