this is so simple why you would lose..
nice googling by the way, that was quicker then I thought it'd be, but not as fast as it should have been, which tells me you scrambled like rabbits with their tails on fire throwing that all together. anyways.....
The only person that is liable here, other then Mkat herself, and it's a long shot, are the "medical professionals" that have not advised Mkat to cease playing a game and participating in an activity that causes her "continued mental stress and degradation". You have stated this is the case, so it must be evident that it is true and diagnosed, or, at the least known or suspected by yourselves and Mkat.
So, if she has not chosen to hit the big "X" button up in the corner of her screen, and her "medical professionals" have not told her to cease and desist although it, by your words, has been diagnosed as the cause of her further physical deterioration, then she is accepting this added stress and the consequences thereof. Which by the way, releases all others of any responsibility or liability.
You just stated that Mkat is aware that this game is contributing to her mental and physical downturn, so, as it is not required by any law or regulation that she plays this game, she does so by choice, and refuses to walk away from something she KNOWS is detrimental to her, which places ALL liability upon herself. Motion denied again.
As far as all of her "real life" friends go...they know her better then anybody, and certainly are not so gullible and/or ignorant that somebody in a video game calling her names could possibly make them believe what is said, when they know her so well in person and in real life. You could never convince a judge or a jury that somebody in a video game chat has convinced all of her real life friends that she is of low moral character when they know her far better then somebody that doesn't know her at all. Motion denied yet again guys.
So, in conclusion, you have stated in a public forum, being close friends to Mkat, aware and knowing of her situation, that she is aware that continuing in this game of Evony is detrimental to herself, but yet she chooses to continue participating despite the risks. YOU guys just released Evony, it's staff, and all of it's members of ANY liability they may have had, if you had not just ignorantly removed the angle of her being ignorant to her own actions detrimental effects upon herself.
Sometimes, the best thing to do, is to say nothing at all....