No, it really isn't helicopter parenting. It's such a stressful time for A level students and having moral support at hand makes a huge difference for most students, even those without any ND traits.
Even when DD was at university she would ring me for moral support at exam times.
I’d go, DD2 is 18 not 8, I never understand the drama about exams on MN, life must stop if anyone has exams!
I never understand people like this who are completely lacking in empathy. A levels are a huge deal, more so these days than ever.
The fact that she might be an 18 year old adult is completely irrelevant. Young people don't suddenly turn confident and responsible one minute after midnight on their 18th birthdays. I have never understood this MN point of view.
I reckon posters who spout this nonsense either have DC who are nowhere near 18 or very bright very laid back DC who never get stressed about anything.
Also, posters who didn't need their parents' support are not the OP's daughter. They need to recognise that everyone is not the same and other young people need different levels of support.
Since DD2 has asked her mum to stay home, I think if the OP goes she will be wracked with guilt at leaving DD2 at home and not enjoy her visit as much.