Thanks. Part of my concern is aggravating the delusion somehow - I don't want to inadvertently lend it more credence in her mind. Another friend (who may or may not be aware of the real situation) suggested she decorate her door; in case there really is someone who was just drunk or confused, the decoration might deter them in future. I started to second that idea, but if it doesn't work, will it just serve to convince her there is someone who means her harm...? I don't know a lot about the condition; much less the rules of the game in discussing it even on a friend-to-friend level...there's research ahead.
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For men are homesick in their homes,
And strangers under the sun,
And they lay their heads in a foreign land
Whenever the day is done."