Yes but words like ‘fault’ and ‘blame’ are thought-ending in what are actually incredibly tricky situations.
If the care plan wasn’t followed, then something to do with the care plan or system implementing it has failed.
If the teacher forgot the plan, then what needs to be done? Regular reminders? The plan pinned to her lesson plan?
If the teacher didn’t understand the plan then is more training needed?
If the teacher cannot reasonably be expected to implement/remember the plan due to conflicting needs in the classroom/hundreds of different plans...what then?