Inbreeding isn't bad for snakes, it's been done for dozens of generations with no ill effects.
You want to breed your Vanilla to a normal and see if you get vanillas and normals. You wont get all vanillas since it's a Co-Dom mutation.
The only way to prove out if she is a vanilla is to breed her a few times to normal males and see if the babies come out looking like her, but you will get normals in the clutch also.
You can also post some pics of her so we can take a stab at seeing if she is a vanilla or not.
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