In the sixth book, it's shown that Luna took up diviantation and was probably one of Trelawney's favorite students.
So, keeping my other headcanons in mind, Trelawney would probably unofficially adopt Luna when she and Harry stay over during summer.
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Harry Potter Headcanons
FanfictionThis was a spur of the moment decision. And unless I brew a crap ton of polyjuice potion, or become Minister of Magic, I don't own Harry Potter. The ideas will mostly be original and hence, property of moi