I guess it's a matter of her house, her rules. Even though you're paying rent, you're living under HER roof, and if she doesn't want snakes in her house then I guess you shouldn't have snakes.
Honestly, another year waiting to move out is nothing. I had to wait close to that until I could move away from a psychopath useless roommate, and I moved in May (thank GOD)! --> That was an ACTUAL problem! I almost turned into a murderer.
Anyways, just enjoy the snakes that you have right now. Compromising snakes overall well being (I don't know how they'd fare in a drawer under a bed) for your "want" of getting more shouldn't be an option.
Just wait it out...It'll go by faster than you think.
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