Cut the demands before you add the support: reduce sensory and social load, give her safe spaces to unmask, and treat after-school collapse at home as the real signal that her school day is costing too much.
Start by cutting the load, not adding a reward chart
Masking is the effort an autistic girl puts into looking like she is coping: copying peers, suppressing stimming, scripting conversations, forcing eye contact. The National Autistic Society describes it as appearing non-autistic, and it is exhausting. Your first move is to lower what she is masking against. Map where she has to perform hardest: unstructured time (lunch, corridors, group work, changing rooms) is usually the worst. Scaffold or cut those pressure points instead of rewarding her for getting through them.
Give her places, and permission, to drop the mask
A girl who masks all day needs somewhere she does not have to. Agree a quiet, low-demand space she can use without asking in front of the class, with a named adult and a break signal she can use before she hits overload, not after. Let her stim, fidget, or stay quiet. Reduce performance demands too: fewer cold-call questions, advance notice of changes, written instructions to back up spoken ones, a predictable seating plan. The aim is fewer reasons to mask, not better masking.
Watch for the after-school cost, and act on burnout early
Masking is invisible at school by design, so the warning signs surface at home: she holds it together for you and falls apart for her parents. Ask the family what the hour after school looks like. Rising distress, lost skills, refusal, or dreading coming in can be early autistic burnout (the NAS describes chronic exhaustion and a loss of skills) or emotionally based school avoidance, not defiance. If she is withdrawing, self-harming, or saying she does not want to be here, treat it as urgent: loop in the SENCO and her GP, and share Samaritans (116 123) and Papyrus HOPELINE247 (0800 068 4141) with the family.
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This page is general information, not clinical or legal advice.