Plan out your most feared questions and answer them as accurately as they can, from your perspective.
Leave it up to her how to respond.
E.g.
Who are we?
We are two people who get together and enjoy each other's company. I like being with you, and I hope you like being with me.
Is that all?
I like being with you, and I hope you like being with me.
Are we exclusive?
If you are asking me if you want to be exclusive, the answer is no. Maybe in the future, but it takes me a while to figure these things out. If you don't want to see me again I understand. I like you and I like being with you, and I hope you like me and I hope you like being with me. And I don't want an exclusive relationship.
practice saying that (if it's true, if not come up with your own words) and say them with complete evenness while holding eye contact. If anything it will make her hamster brain spin round and round.