I've watched her play a bit, she's no noob! She's developed an eye for measuring distance to invite dashing, and knows her character's abilities. Not to mention she's played through more than once.
Afaict, you've got to combine Ironman with time limit to get close to challenging once you're comfortable with tactician.
She's misclicked and ended an ironman run in the blighted village. Not surprising, I've found levels 3 & 4 the hardest.
By time limit I don't mean speed-run, but no completionism. Weave a fairly straight line to end of Acts, foregoing some sidequests and treasures. Give yourself say 80 hours to complete.
