Hi there. Since you have the elder's number, feel free to contact him and let him know what is going on. Explain your situation exactly as you described it on the forum--that you aren't against her activities, but it is too great a hardship on your family to have your wife pioneer, and you can also explain the disrespectful behavior she has been displaying towards you. If he has been helpful to you in the past, he may ask her to step down from pioneering, or possibly do a smaller amount of preaching work. He also may counsel her on her disrespect of you. Normally going this route isn't helpful, but in your case, you need to fight fire with fire.
Someone suggested professional counseling and I say go for it--if you can drag her into there. Good luck.