I am sure its not a Qatari Lady because they are very polite and homely. Compared to other GCC countries Qataris are far better in dealing with expatriates. They have a culture of love and progress.
Whether its a big or small mistake, a smile on your face melts the anger. The way the Indian lady re-acted was the best.She is from the land of MAHATMA GANDHI. If she also banged the Arab lady things would have worsened practically & legally. The Arab lady will get her REWARD somewhere else.