User blog comment:Martialmaniac/Guys, check out the spoilers for chapter 377/@comment-4896558-20180308175625/@comment-4896558-20180309095547

Someone already marked it as unknown, so I guess we should keep it as that. Honestly knowing Togashi she's dead or not really dead who knows! It's like how one of Chrollo's Skills in his book stayed after a resident of Meteor city died, because of Nen that becomes stronger after death.