Best floor dimensions for adult female BP

Hi everyone.
I'm ready to upgrade my female BP's enclosure to what she will live in for the rest of her life. I was wondering what you all think is the optimal floor space, or if it really matters all that much. I'm not concerned about the space the tank will take up, just more concerned about giving her ample room to roam. I know ball pythons are typically lazy, but mine is quite active :)

What seems right to you?
36"x18"
48"x12"
48"x18"

12" wide seems a little skinny to me, and I'm worried if she gets girthy she'll feel cramped. Is this ever an issue?

You are correct that 12 is too narrow. 48×18. would be the better option but if possible, I'd say look for a 48×24, especially since you said she's fairly active. That floorspace is readily available in several models from Animal Plastics if you want to consider pvc cages :p
Can't recommend them enough!

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Originally Posted by MissterDog

You are correct that 12 is too narrow. 48×18. would be the better option but if possible, I'd say look for a 48×24, especially since you said she's fairly active. That floorspace is readily available in several models from Animal Plastics if you want to consider pvc cages :p
Can't recommend them enough!

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Thanks for the recommendation and advice! On the internet I see a lot of people keeping them in narrow tanks but it definitely seemed a little odd to me.