Stims or Tics?

Hi again, 

My 14 y.o keeps having these random outbursts, I spoke about some of the challenging ones in another post... 

Anyways, when I stand close to her she will out of the blue try bite me. She will randomly flap her hands, and she will look at me confused, she will also say 'That took me by surprise' and start laughing slightly. I mainly spoke about them in this post:

HELP!!! - Parents and carers - Home - National Autistic Society - our Community (autism.org.uk)

I'm getting confused about her behaviour... 

Any help is very much appreciated

Thanks x