I would contact the neurosurgeon.
Hello, Thank you for your question. If you have continuous symptoms like that, possible causes may be shunt is either under-draining or over-draining. Your doctor can assess this with a lumbar puncture and measures the fluid pressure. He/She may make some adjustment of the shunt to allow it to drain more and can monitor if the symptoms improves. Another possibility could be shunt is over-draining, that may lead to low CSF pressure that can also lead to headache. This may improve when the person lies down and gets worse when the person sits or stands. Other possibility could be any circulatory disorder related to heart condition or blood vessel disorder. As you are suffering from continuous symptoms, please arrange an appointment with a neurologist right away who will evaluate the further underlying disorders here that may be the main reasons of her headaches and can suggest her appropriate treatment. Hope this information proves helpful to you.