Heart murmur

My 10year old disabled daughter has just been diagnosed with a systolic aortic heart murmur. She has been getting alot of chest pain and has also put on alot of weight. She is 4ft 10" and weighs 10st 7lb.
The murmur has never been picked up before when she has been into hospital for opperations.
What would have caused this and why the pain and weight gain. What can i expect from the cadiologist?

[Jerry_NJ]

I do not know of any relationship between a heart murmur and weight gain, or chest pain.

I believe many people have heart murmur and it is not dangerous.  I think most case are just monitored, perhaps even echocardiograms every few years to get an accurate measure on how the heart and all its valves are working.  A murmur can also be caused by a leakage between heart chambers, which I believe are usually left untreated.