I know a now 30 year old man with ASD he is a nice, gentle guy but he can lose it and become potentially dangerous. Not his fault but his disorder. Fortunately his mum can control such incidents, his dad less so. Carers less so. General public, other family members and police I very much doubt they'd handle him in an agitated state without a degree of violence or force of numbers against him.
Autism, or ASD, is a wide ranging spectrum disorder operating on iirc 7 spectrums (not a straight line but multiple lines or a radar chart). Without knowing the aggressors diagnosis her behaviour could be self controlled or not. I suspect she is sufficiently high function to be charged and found guilty in the first place such that ASD is not enough of a factor to affect her actions being an offence.
This is one appeal relying on technicalities within the law I reckon, loopholes or other questionable point.