Welcome aboard!
I think you're already doing the right thing by teaching her about the snakes and how they are kept. There's not much more you can do, besides proving to her that you are able to take care of it and that it can't escape. She needs to get used to the idea of having snakes around and exposure seems to be the only way to deal with fears. I don't suppose you know somebody who keeps snakes and could discuss it with her?
I also know a couple of dirty tricks, but I better keep them to myself.
They can backfire so easily.