Each "combat" fairy (and Eileen and Hanastrew are the ultimate in these) has to fill in a 10 page form, detailing what they did, to whom, why, could they have acted differently, what lessons did they think they could learn from the experience, and how much magical energy did they use.
Eileen did try skipping the more irritating questions (especially the what did you learn one) but only found her forms repeatedly bounced back to her by the Queen and her Council. Eileen only filled the forms in properly to save her time being wasted by the continual bouncing back of incompleted forms. The Queen considers this to be one of her rare victories over her cousin. (Eileen does too and resents it. She never has been a good loser).
Hanastrew, partly because she was warned by Eileen, has always filled her forms in properly and spends a lot of her evenings catching up with the wretched things. Could the ladies use magic to fill in the forms for them? Yes, but the Queen and her Council consider it cheating, prefer the personal effort in putting pen to paper directly and will bounce back any forms not filled in that way. Hanastrew and Eileen have realised it's quicker to comply. They don't like it. They won't ever like it. But until they find a way around this, they're stuck with it.