How can i stop my sons nasty little wife ruining our life?

I simply lock horns with my daughter in law constantly. Shes not whom we would choose as a wife for our precious son, but unfortunately, we had to let him make this choice as he was brainwashed. He is 42yrs old and his wife is much much too young, shes only 23 and well, frankly, not suitable. They are married 6 months. They live 2 doors away. I have to go down there daily and help my son with his cooking, cleaning and she simply refuses to iron his clothes. He sometimes arrives up at my home with dirty dishes stacked in a cardboard box so that my husband and I can use OUR dishwasher to wash them as he has no crockery to eat from. I do not agree with the way she dresses, it is much too provocative for a married woman. She is utterly cheeky to me and will not take any input from me. I just find her a spoiled kid from the wrong side of the tracks. I detect a hint of regret in marrying her from my son but i can tell he does not want to experience the stigma of a divorce this early on in a marriage. She is full of modern ideas and notions. My son has confided in my husband and I that she is continuing to take her contracptive pill even though they are trying for a baby. Also he said she refuses him often any advances and i find this heartbreaking. How can i save my son from his unsuitable wife? I am moving into their home for 3 months while ours is being refurbished. My son has agreed but i think he has not mentioned it to my daughter in law yet as he seems afraid to. How can i stop this nasty little woman ruining our life?