OOC

I were just trying to move this story forward. I'm sorry if that was not helpful.

OK we are still in the same room and I'm waiting to see an action from any player to narrate.

Well. Tante. You at least don't smell like a frog. :) Still a ribbert'ing experience.

@mathias0077 if you are using a 2nd level spell slot instead of 1st, you can roll another 1d12

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial damage increases by 1d12 for each slot level above 1st.

That would also be helpful if you provide damage type to me in future (I've already checked it lightning) just as WanderOne did. At such high level combat encounters it is common for enemies to have quite a few resistances, some immunity and some vulnerability for me to apply.

@Psybermagi
That'interesting question seems you are not first to as
What happens when Polymorph is cast on a creature already affected by Polymorph?

While this and few other forums refer to the Player's Handbook, page 205, I am cool to ignore that rule because Tante Lude isn't really under the spell effect.
Nevertheless there is a different issue - spell specifically say
And beast in DnD is a creature type other than humanoid. Basically Polymorph turns something into an animal.

So I suggest you to edit your last post and choose different course of action.