What Causes Acid Reflux In A Child While On Prevacid?

Question: Hi, my daughter is 16 months and was diagnosed with silent reflux from a very early age due to crying when drinking her bottle, arching back and falling asleep while drinking. She was on prevacid for two months and things improved so I took her off of it.Once she started solids, she became extremely difficult to feed because she would not accept most foods. Now this problem still persists. She is an EXTREMELY 'picky eater.' She has only a few foods she likes, and other foods she may try but will not eat. It is tearing me apart because i cook so many meals for her which she simply does not eat. I am tired, frustated and don't know what to do. She also recently dropped from the 55th percentile to the 20th. She is seeing an occupational therapist who thinks she may still be dealing with reflux and i suspect she is right. I thought babies usually outgrow this by 12 months. Does this mean since she has not outgrown it by now she will have this condition for the rest of her life or at least for many more years? What are the chances? I am afraid of putting her back on prevacid because of the damage it can do to her kidneys and liver (side effects from long term use) if this doesn't resolve. Also what is a good diagnostic test they will perform on babies to see if it is reflux? I am not comfortable with any nuclear testing because of the high levels of radiation.