If your wife is still pregnant or nursing, she should probably not take herbs to disolve the stones or deworming or anti-parasitic herbs.
Eating fresh apples and drinking fresh apple juice for several days before the flush might help soften the stones. Tart green apples provide a mild form of malic acid.
Make sure she cleanses the bowel after each flush as well, to keep traces of the toxins released from the liver from being reabsorbed into the bloodstream from the bowels. Cleansing frees toxins, and you want them out of the body as quickly as possible -- especially if the baby is getting everything!