LW, I don't have high hopes that you will do any good, but if you're set on contacting the school, a phone call with the principal is a better idea than a meeting. A physical letter to the principal in the mail might also be worth trying; there is no guarantee you would get a response but it might at least stay on file if other issues with her come up, and writing it out and mailing it might at least give you the sense that you have done the thing.
But procedure wise, I would say the #1 thing is to figure out if you're interested in having any contact with Lisa, and then making that boundary clear to whoever you contact. It sounds like what you probably want to do is say, hopefully in writing/email, "I am still traumatized by my experiences with her, so do not give her my name or provide her with any other way to contact me". Otherwise you've got pretty good odds the person you contact will decide that what you need to do is talk it out with her or accept an apology or that they need to give her a copy of your letter and nope nope nope nope nope nope nope nopen.
no subject
But procedure wise, I would say the #1 thing is to figure out if you're interested in having any contact with Lisa, and then making that boundary clear to whoever you contact. It sounds like what you probably want to do is say, hopefully in writing/email, "I am still traumatized by my experiences with her, so do not give her my name or provide her with any other way to contact me". Otherwise you've got pretty good odds the person you contact will decide that what you need to do is talk it out with her or accept an apology or that they need to give her a copy of your letter and nope nope nope nope nope nope nope nopen.