A child may develop pain in a finger for many different reasons. Talking children will be able to describe the specific features and location of the pain. Infants and toddlers may only be fussy, and identifying the source of pain may take some detective work. Joint damage, muscle irritation, bone disease and skin destruction are common causes of finger pain.
Trauma
Direct injury to the finger is the most common cause of finger pain in children. Typically, there will be signs of bruising, a cut or a scrape that will help you to detect an injury. Other injuries can be more subtle. If a child complains of pain and you cannot see any injury, be sure to look closely. Use a magnifying glass to look for splinters or foreign objects like glass. Younger children can even have a piece of hair wrapped around a digit, cutting off the blood supply, known as a hair tourniquet.
Read more: http://www.livestrong.com/article/532917-finger-pain-in-children/#ixzz1rf7Fnruc
This sounds like growing pains ,children of this age do seem to have many aches and pains, its tough isnt it to see our children in pain , I think that a visit to the doctor is in order just to check her out ..good luck let us know how she is doing .