That's why almost every action causes a lot of daughter boards. Not the worst option - when they are advisory in nature and are presented based on life experience. Much more unpleasant if all replicas are filled with sarcasm and humiliate young wife as a mistress.
Ideally, to improve relations in-law to help her husband. That it is incumbent tactfully explain to my mother that the choice he made himself and his all completely satisfied. When the character of the husband does not allow her mother to put in place, daughter falls harder.
The very first mistake - this is an attempt to call for common sense or start trench warfare. Poor-law, or as good as any adult, it remains at the opinion. Open confrontation only leads to deterioration of the nervous system, but those results also does not work. Many psychologists recommend to take it for what it is and try to love, but like afford not for everyone.
Output is quite simple: if love does not work or not for that, you can simply ignore it attacks. It is unlikely that someone will take too much to heart rudeness in public transport or store. If the position antics in-law as such displays, the transfer will be much easier.
Also, be aware that the world-in-law - is the key to a happy family. It is best to have a friend in her face, but not the enemy, and then in difficult situations it will help, but will not configure a husband against his wife.