I will be pausing communication until I am able to resolve this with my dean. Sharyn has chosen to directly threaten my academic career. I will be taking the necessary actions to address this.

Take aook at what she sent @joabaldwin.com and provide that too as evidence she is a fucking nutball Also I would get an emergency restraining order asap they are simple to get usually

Your university might offer legal services to students. Mine offered a free consult and low rate representation if they thought you had a case. Might be able to get them to send a case and desist letter?

Yeah what this company is doing isn't legal in any capacity, but I'm no lawyer. You may need a lawyer. It's harassment if I've ever seen it (with the spammy emails) and they're spreading false information by stating that you and others are harassing them.

Good for you. Don’t back down, creeps like Sharyn are used to getting what they want by fucking around. Time for them to FIND OUT! You did nothing wrong. Remember that. Good luck!