Having said that, Eileen has always fought bravely, has repelled or killed those threatening the magical world without fear or favour. So there are many relieved to hear she has left her former world and certainly before The Trouble With Mother gets underway Brankaresh was assuming his difficulties with one of hte most awkward royals the realm has ever produced were long over. He was not pleased to be wrong. Still even without Eileen getting in his way, Eileen knew she'd end up going back to the realm at some point. If there was one thing guaranteed to affect a magical world, it is the fact that it will end up being threatened by something coveting its powers and Eileen knows deep alone she can't leave her former colleagues to their fate.
Eileen has written her own version of certain Kingdom events and these books are kept in the Palace library. Nobody is allowed to borrow them. The only reason the books exist is that the fact Eileen did write them is a historical event and is treated as such.