Similac Organic is not a hypoallergenic formula, so not suitable for babies with milk allergy or intolerance, so if she is certain that her LO does have a problem with milk proteins then it's not a wise choice for her. Soy would be better than a milk based formula. Enfamil makes Nutramigen in the US, so can she not get that? Or is it only one type of Enfamil that they will give her?
If her doctor thinks that the baby is not milk allergic but wants to do an invasive surgery, it does sound like there is a bit more going on....if she's not happy with her doctor's diagnosis can she not ask for a second opinion?