Some of the biggest problems can occur during less structured time. Play times are particularly prone to problems. This is the hardest to support and the one thing that can make a huge difference sometimes.
They won't always mean how things come across, it is the choice of words/tone of voice that is wrong not the concept they are trying to convey
space - respecting other's space/not liking people invading space can be tricky with carpet based work. The spot seating system in this can help establish rules for all on this.
Think about the impact of change of routine, what most kids feel is fun might be hell to an asd kid. Eg Christmas lead up events and fun activities. Do not tell them it WILL be fun it can create more stress when they find it stressful and think they are failing to have fun.
loud assemblys can be tricky, removing might be a short term solution but if reintroduction to assembly occurs it does not mean that they are ok with the assembly and wont need to be removed when there is alot of change (lead up to christmas/end of the summer term etc). It can be one step forwards, one back, two forwards, one back, one forwards, two back progress. Stick with it, understand and in the long run progress will be made.
Literalism to the nth degree, the way you chose your words will impact more greatly. They don't pick up on unspoken/assumed follow on rules, you will have to make rules very specific and cover all bases.
Eg here we have to say "good night, sleep tight. See you in the morning unless there is an emergency such as you are hurt, it is dangerous and some one might get hurt "
it was like this for a year but now we have it down to 'good night, sleep tight see you in the morning unless I need to wake you due to normal rules.'
before we had this rule ds woke in the night, needed help due to a nose bleed and didn't wake me up because it wasn't morning. So be aware of unexpected consequences from literalism.
Do not expect her to tell you what is wrong, 99% of the time she won't be able to. She may well not know what is wrong, she may well just know it isn't right. Parents can help, as can knowing a child's tells when they are struggling.
And ASD individual's biggest problem can be other people and the expectations placed on them. Some times it can be the expectations they put on themselves. Frustration can be expressed in many ways.
Often you can think the problem is one thing, but mostly it will be about something else. Delayed response and the last straw trigger point can be common.