Friend should have taken better care of her stuff. If he was busy and had another fare right away he might have never seen it and it could have been taken by another passenger. Best she can do is use the app contact uber under I lost an item and wait. She will have to pay 15 dollars for a lost item fee if the driver has it. Might take a few days for him to do it aswell some drivers have another job or don't live anywhere near where they might have dropped her off.