That's a tough situation, but I think the law would be on your side. They knew about them before you moved in and if you have to you can fight it or at least drag it out long enough that you can save up to move.

I don't believe that keeping snakes should be a dirty little secret with everyone afraid to take them out in public. There are lots of people terrified of dogs, but I'm still allowed to walk my dog up and down the street if I want, so why can't I take my snakes out?

Honestly, I would just explain again that they are harmless and see if you can talk to your neighbor and help her understand a little bit better.

Good luck!