Based on how it is used in this passage, what is the meaning of the phrase in italics?
Hattie watched her mom scour the kitchen counter tops before racing to her bedroom and then to the bathroom. Jasmine asked in a curious voice, "Mom, what is going on?" "I'm running late and I can't find my sunglasses anywhere!" replied Jasmine's mom in total frustration. "The sunglasses that are on top of your head?" asked Jasmine. "Oh, my! Those are the ones! Thanks, sweetheart! answered Jasmine's mom. Jasmine shook her head and said to herself, "She has lost her marbles!"