Maybe it bothers you because it's a greeting, said with no personal meaning that you, elsewhere, be blessed. She is just mouthing it to everyone.
I know I don't like it when someone says "Hi, how are you?" as a greeting, and they really don't care how I am doing. Go ahead, test it out. See how many people are ready to listen if you do not reply with the standard "Fine, thank you". Try telling them how you really feel, good or bad, and see their reaction.
tal