Question ICP Monitoring

Hello

I am new to this forum but not new to Hydrocephalus. I actually have two kids with vp shunts. My yougest who just turned 6 has been having severe headaches since Dec 20 some with nausea and vomiting. On MRI one ventricle has almost collapsed around the shunt but the other side looks normal. They tried to adjust her programmable shunt but headaches continue. They are not sure of pressure too low or too high . They mentioned the antisiphon device as something that they could use if too low. Now they want her to come to Hopkins on Thursday and have icp monitoring for a few days. Of course I am nervous for the procedure and upset to put her through something but hate for her to feel bad too. Has anyone gone through this?