My son had colic for six months, day and night. I think colic is mainly a catch-all term for a baby in distress.
If she is mainly breast fed I would agree that a likely suspect is what the mom is eating/drinking. Also, just switching from breast milk to formula may be hard on her little tummy.
One thing's for sure, whatever is wrong, throwing drugs at it won't fix the problem.
Sorry I couldn't offer more. I hope you can find something really compelling to present to them,