If the mother has oversupply on the one breast.  It would be interesting to
have her do a test weight with the M scale.  I have evaluated women with the
same symptoms and found that some mothers may have up to 9 ounces in one
breast.   This means the baby has to take in big amounts in order to get to
the hind-milk.  After a careful evaluation to determine if this is the cause
of the colic.  Simply pumping off some milk prior to feeds will usually solve
the problem.