I was diagnosed originally at 3yo with Asperger’s. As mentioned by folkrav this diagnosis is outdated, ‘Asperger’s Syndrome’ isn’t a thing anymore. To the best of my knowledge it’s currently all Autism Spectrum Disorder with numbered levels associated with each diagnosis ranging from 1 to 3.
The old Asperger’s diagnosis is, AFIK, translatable to Autism Spectrum Disorder Level 1.
Unfortunately ‘Creepy’ is subjective and poorly defined. It’s a feeling rather than ‘this meets XYZ criteria and therefore is creepy’.
I agree with you that she’s not using ‘stalking’ correctly but I believe this was meant to terminate your platonic relationship. It’s upsetting but that’s likely the point.
This behavior is much more in-line with a correct usage of ‘stalking’. I would assume this escalation was taken as being fair game from your refusal to accept her use as stalking. That’s vexing but likely meant just to highlight their desire to terminate the relationship as that wasn’t clear from her first accusation.