[Eternal]

I think its best to give her some space for a little bit so that she can cool down from this, and then try talking to her about it in person. If you tried explaining now, she probably still won't believe you. So wait until she calms down and then let her know that it was purely an accident.
Communication is very important in a relationship, and fights are common to happen. If you two ever get in another fight, its best to step away from it for the time being, otherwise you could end up saying things that you don't mean.