What is the character and personality of Mrs. Meers in Thoroughly Modern Millie?

My high school is going to perform Thoroughly Modern Millie in the spring and I really want to try out for Mrs. Meers, but I need to know more about her character. Like does she have an accent in her regular voice?(not her fake Chinese accent) Please help, I really want to get this part! Also, if you have any acting tips or anything. Thanks!