G.B.
Does she cough during or after swallowing food? Difficulty swallowing food is a medical condition called Dyspagia. It should at least be contemplated.
A simple magnesium deficiency can cause dyspagia.
see: http://www.buzzle.com/articles/symptoms-of-low-magnesium....
There is a product called babycalm or kidcalm that you could try. It is a magnesium supplement dosed for small children ( I am not a distributor, you'd have to look online for it). Magnesium is safe to self dose unless your kidneys are compromised.
Esophegial webs can cause dysphagia. They have been associated with iron deficiency and/or celiacs disease(inability to eat gluten). I personally think Iron deficiency is more difficult to get in a standard american diet (our processed foods are fortified with it) but it does occur in some people, especially people with bleeding disorders. Do not give iron supplements without a clear test of iron deficiency.(always see your pedi first) Over-iron supplementing in kids is very dangerous and even fatal.
Regards,
Gail