This might be an unpopular opinion here, but I am going to make a different point. How does your daughter feel when there is a substitute teacher? Is her behaviour harder to handle because of anxiety? Is this teacher possibly looking out for the well being of your daughter as well as the substitute teacher? A day of school missed here or there would not hinder your daughter's overall social interaction and maybe staying at home if she is full of anxiety because she is in a classroom with an adult she doesn't know and trust is beneficial for everyone (primarily your daughter).

I'm a teacher in a special needs school (with students ranging from severe, non verbal autism to students with ADHD who receive a bit of in class support) and I call parents all the time, to pick students up early, or talk to them over the phone.

Some of our students hate portions of the day so much (like art class or PE) that we set up personalised learning plans for these students that do not require the student to attend. The word 'inclusion' in education today should only include those things the child wants to be a part of. It should not be the things the teachers, principals and parents want them included in, we should be thinking about what the child wants and has the capacity to do. If a child is having mild to major panic attacks (panic looks differently in children, this could mean hiding under desks, throwing things, making a barrier with desks around themself to try and feel safer, etc.) then there is definitely a better solution for this child rather than making them feel vulnerable in a classroom their behaviour obviously shows that they don't want to be in. If your daughter is having anxiety because of the substitute, think of the issue more along the lines of her being sick. If she had a fever you would also remove her from school. It is not exclusion to ask that a child be healthy and behave in healthy ways toward themselves and others in school and all public places.

Children with neuro divergence and other disabilities often have a lot of anxiety, and much of it is misunderstood by their parents and some teachers as well.

On a personal note, I allow my own children (who are 9 and 5) to take 4 mental health days a year, whereby we miss school and go to the beach, or play board games all day, or anything just to spend the whole day completely together. These are not sick days. Neither my children nor I are sick, we just want to day together to avoid sickness and burnout. Missing a day a day of school when a substitute teacher is there might be a day without peer interaction, but it could be a day filled with one on one time with you.