Carissa Sevar, probably, is not going to be fully functional until she has a +6 intelligence headband. There are not any of those going spare even when you are Abrogail Thrune. They have owners, from whom a headband like that cannot be likely seized.
So Carissa Sevar has now been tasked to make herself a +6 intelligence headband.
With a slimy devil wrapped around her, not at all like a lover's caress, summoned and bound by Abrogail Thrune.
The devil is of a kind that Hell sometimes tasks to forge magical items. It cannot advise mortals on how to craft. The devil is not forbidden however to monitor them in their crafting, assess their general level of performance, or apply motivation.
Carissa Sevar is being hurt, quite badly, at the end of any thirty-minute period in which she has not exceeded her past best performance in crafting. Any time she escapes that, of course, it sets the bar higher for next time.
When Carissa's magic fails her, she is put to sleep; when woken, set back immediately to work. Her Ring of Sustenance means she needs no food, no other breaks.
It would shatter most mortals like glass, but then, Carissa Sevar is not most mortals.
It will hopefully prevent Carissa from thinking and feeling for a time.
It will hopefully be punishment enough that Carissa stops feeling unpunished.
Failing that, Abrogail is curious about whether Carissa can be brought to her fifth or sixth circle this way before even her will breaks.