Murphy's mom can be heard crying and pleading with the 911 operator: "My daughter is passed out."
During the call, the composed 911 operator tries to instruct Murphy's mom and another person in the room how to perform CPR.
Murphy's mom says Brittany was walking around dizzy at one point and "couldn't walk right. She's had a cold."
Murphy passed away on December 20. A cause of death has not yet been determined.
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