i think she was into some kind of witchcraft, cuz we can see that all her posts in her facebook timeline was that of the Black mirror curse stuff which is apparently a witch;s thing. So since dint have any friends in her life she must ve turned to this stuff.
OR, when laura goes to the school Marina studied in, her teacher/ ward (dont remember), she mentioned that Marina used to be online all the time and used to stare into the computer for long time. so maybe she got lost into the deep web stuff and learnt witchcraft from there.
OR, maybe her mother was a witch once.
hope that answered it.
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