Is one of the person you are moving in owning the place? Or is her name the name on the lease?

Either way YOU are moving in with other people therefore so ultimately the person owning the place/being on the lease will make the call on what she allows and what she doesn't (dogs, cats, snakes etc) - And of course if she leases the place what she allows must comply with what the lease authorizes.

If you want to move in with them they still do not agree on the snakes you need to respect their wishes, calling them names, lying will not get you anywhere. (Remember YOU will have to live with those people and living together is already hard enough that you do not want to start on the wrong foot)

The best for you would be to move with people that snake friendly or move on your own.

Not everyone like snakes, or dogs, or cats etc and no one should be forced to live with them if they do not wish to.

The good thing if you get YOUR own place you can make YOUR own rules.