Are these signs of Leukemia ?!!?

my 16 years old, has had a ongoing back ache that hasnt gone away, she sleeps about 12-15 hrs a day including naps. shes always tired no matter what. Ive looked up what she could have and this seems to me what she has the most symtons alike. If anyone has had a child with leukemia please answer me and tell me wht your child experienced