DD hates change

[Jennywren8]

My DD (11) is one of four children and is a really lovely and kind girl.
Our eldest child (now 17) had a similar temperament and has caused us a lot of problems and worries over the years, cumulating in a ASD diagnosis when he was 15, which he doesn’t accept.
Over the last few months, DD has started to have real meltdowns, for example today we had carpenters in to fix new doors and she had a mega meltdown when she got home from school, sobbing and screaming that she hated the doors and is still not talking to me.
DH said that we should probably get her assessed for ASD too given that she shows these traits - the thing is that it will take ages (took 3 hrs with DS through CAMS) and actually hasn’t brought any real benefits, for example, our local school will allow extra time in exams etc and without a written diagnosis.
Question is, is it worth us seeking a diagnosis for DD?

I would seek an assessment. You could look at right to choose, which is often quicker.

Personally, where relevant, I think diagnosis is important for understanding oneself and others understanding you.

Although you are right, with a few exceptions, most support is based on needs rather than diagnosis.

Do you try to prepare her for change if you can e.g. show her pictures of the new doors, put the date on the calendar. You could try social stories too.
As your eldest is autistic I expect you know the strategies.
Puberty is probably adding to her difficulties right now. Challenging for any young person but heightened for those who are ND.
Autism presents differently in women and girls and she has probably been masking which is stressful and will mean she is more likely to have meltdowns at home.
I would explore a diagnosis ( as PP suggests) as it might help her moving forwards to understand why she thinks or behaves in a certain way.