It starts at 3rd is what I mean. There are a couple of points where there could be a milestone attached, or you could follow an XP-Granting system for the investigation and combat challenges.
Talked to spouse (the writer of the adventure) it's a single-level adventure. 3rd to 4th.
We're over 200% funded, at this point!
Let's keep going! I need to build the next book... Island Hopping Pirates and a quartet of classes that fit that theme!
So there's the 2019 answer to that question, two years before her own actions were revealed. That should settle that specific aspect.
As far as the main thrust of her character:
Abusers do deserve the chance to become better people. Whatever the abuse is. Racism, homophobia, ableism...
So... the idea of "Skilled Play" is ultimately a false canard. There's no such thing as being 'skilled' at playing D&D of any edition.
You can get skilled at making characters. More knowledge, better at learning how to use the system and recognize interactions...
But also you can just learn...