I doubt this is true, but if it was I'm not surprised she'd read Meditations. It has to be the most surface level philosophy in existence, the equivalent a picture-book for would-be-intellectuals. There's a reason every bookshop has half a shelf dedicated to it, it sells to retards wanting to feel enlightened without having to apply critical thought to anything, since it consists of short, disconnected passages that don't espouse a particular morality, nor cross-reference anything else the author has said (which makes sense given it was the guy's diary). The essential message of 'focus on the shit you can control' should really be obvious to anyone with a few braincells spinning around their head, although I am curious how the horse would reconcile this with the fact she has no control over anything and should just kill herself.
Also, Marcus Aurelius was a pagan and actively persecuted Christians, so good job with that whole trad LARP. Much of the book could be considered blasphemy given it explicitly advocates for the lack of an afterlife.