You made sure all the sliders are up ?
Does she have a case? If so, which one. Some cases can affect the outgoing volume
If you can test making a call while on it if you can use the volume up button to see if it goes higher the volume?yea, all the sliders are up...
If you can test making a call while on it if you can use the volume up button to see if it goes higher the volume?
Another thing if it checks ok , try safe mode making calls if samewill do