Shall i apologize to my mil????

You are upset over this and rightfully so. She was in your house and should follow your rules it is as simple as this. It was rude for her to leave your home without thanking you for being so kind to let her stay with you. 6 month is a long time and does not allow her to run your household. Perhaps you can put together a polite but firm letter which states your point. I am sure MIL is waiting for your husband to come home and to call him first thing. Beat her to it and send her your cart or call her. I bet she does not expect you to speak up for yourself. But if you don't nobody else will. I have seen countless husband just stand by wile their mothers batter their wives. When it comes to their own mothers man seem to loose their ba..... Remember in your home you are the queen and master. Don't let your MIL forget this.