Amazing, I would try asking to speak to the practice nurse for advice, she should be able to get to the doctor if needed. Failing that, I would ask a pharmacist for advice, and hopefully something good to soothe the cough.
Decorhate, DS too was so ready to start today, and just get on with them now. He was packing his bag last night for his exam, and said that he quite enjoyed that, feels like he's getting ready to battle!! Best of luck to your dd.