Dear WiGator,
As mentioned above, in general, brief sharp chest pain is common in children and adolescents and is benign. We don't know what causes it, but it is probably something musculoskeletal. Obviously, without seeing her, I can't say for sure what's happening, and can't rule out specific issues with her heart or chest wall, and I do agree with having her seen by her primary care provider to make sure that nothing else is going on.
Thank you Grendslori. That was my initial reaction since she's a healthy girl. From my football days my deduction would be a muscle pull or cramp.I hope all is well with your child.
I'm sure one of the doctors will be on here soon to help you, but in the meantime I can tell you that 'sharp' pain is generally never caused by a heart issue. Obviously, I am not a doctor, but I have raised a child who had true heart related chest pain due to a lack of bloodflow to the heart muscle. Chest pain is usually dull in nature and brought on with some exercise although if the heart muscle receives little blood flow than the child can have chest pain even at rest. Based on what you have written, I don't think a heart problem is the issue, but I would certainly take her to her pediatrician and have him check her out.