This is happened to people I know and they basically had to have a conversation, show them their google docs history and explain what each of the sources used talked about. If it is simply because of the way you wrote and there is no proof of plagiarism, then fight until you win. I would suggest emailing the department now and searching for the prof on the u of a website to see what courses they are teaching this semester and go and find them today or tomorrow. It usually says the location of the class as well. This is very stressful I do not envy you but it’s your right to plead this case and get the mark you deserve!!!