you seem to have left out a very large part of the story. When the cops came they would have interviewed anybody at the home that was a witness to the incident. It was likely from those interviews and the plaintiff's rendition that it was determined there was probable cause to charge you.The cops came to my moms to "question me and get my side of the story or physical evidence" which I sustained bruises and scratch marks.
I suggest you stop talking to anybody, including your boyfriend and mother, about this. They are witnesses. Attempting to persuade them to testify any particular way is witness tampering.
and yes, a small person can be guilty of assault

