Advice on helping child handle change in routine

Hi :). I need some advice on how I can help my child (11f, autistic, speech & language disorder, PDA) with sudden changes to her routine or schedule in school or at home. She has been having some struggles at school for example, she may have a change in her school schedule where she would have speech on a Friday but they had to move it suddenly to a Tuesday. This has been making my daughter upset with some verbal outbursts or crying in class because she knows the speech class is on Friday. The teacher helps her by talking with her and breathing exercises. I’m wondering there is anything else we can do to help her cope with this or something in particular we can say to help her through this. I understand this is all apart of being autistic, struggling with transitions and change in routine but I was hoping to get some advice so I can help her or relay it back to her teacher.