Not a child but my Dad recently had most of those symptoms diagnosed as GORD - particularly the cough. He put up with it for years before my Mum made him do something about it. He started medication and had a great result.
I believe there are quite a few natural remedies, but my dad's not into 'that' as he puts it.
Stuff like being upright after a meal, sleeping on an incline and identifying triggers should help.

Hope she gets some answers tomorrow.