@purplerain44
Our son used to struggle with the concept of "making mistakes." If he was writing something we would have a complete meltdown if he made a mistake and had to rub it out. He was also incredibly slow and laborious at writing stuff down.
When he went to secondary school they let him use a laptop which was much better as of course things can be changed and there is no visible evidence of errors. He was also much quicker at typing than he was at hand writing. Since then he has always been allowed to use a laptop in all exams too.
Homework used to be unbelievably stressful for us but eventually the school arranged for him go to Homework Club in the lunch hour and he did it all homework at school.
Executive function has been a huge issue for him right the way through school. Paying attention, organizing, planning, and prioritizing, starting tasks and staying focused on them to completion, self-monitoring etc. Being unable to do any of this without support was instrumental in the mainstream FE placement breaking down completely and bringing him very close to a breakdown. It didn't help that they had no real understanding of autism and just expected him to fit in with everyone else either. 
Part of his problems with executive function was down to having problems with processing information, so the way mainstream lessons are delivered was too fast for him to take in, so a lot was going over his head. Mainstream teaching is typically done through talking with very little in the way of visual aids.
DS's working memory is also impaired. I only realised this after some very detailed clinical tests were carried out when he 20, and we were fighting for an EHCP for him.
When he went to his next placement, a specialist college for students with autism, organisational skills etc were part of his outcomes he had to work towards. He is now able to organise himself without support. If he has to be at an appointment at 10 o' clock somewhere, he is ready well before time, has looked up the bus times in advance, sets off by himself and arrives on time.
He sometimes had issues when he had a lot of homework last year, but by and large he was able to organise himself and manage it with minimum support. It is truly amazing how far he has come.
I think the reason he has overcome these difficulties was down to having teachers and support staff who understood autism and had all been well trained to work with students with autism, different teaching methods, being taught how to break tasks down into manageable steps, alongside social skills training and speech and language therapy which improved his communication skills and fostered his confidence and self esteem.
As I said previously, I would keep pushing for your daughter. It may also help to keep a diary so you have a log of all the day to day issues as they arise. In your shoes and in view of the masking at school and subsequent behaviour issues at home, I would seriously consider applying for an EHC Needs assessment.
www.ipsea.org.uk/ehc-needs-assessments
It is likely you will have to fight for it as many LAs routinely turn down these requests and then back down when parents appeal, so the process can take a very long time.
It was 71 weeks before our son got his EHCP with the placement he wanted. That was after 2 appeals to the SEND Tribunal and DS being out of education for a year. 