It would seem its just a big loop unless that imposter of marisas teacher ended the loop?
I remember also that in another comic they had the same thing. A scientist created a time machine so they tested the machine by putting a apple in it. When they opened it a whole bunch of apple came out and one of the. People who was there killed all of the scientist and kissed themselves by ending the loop somehow. So maybe that marissa is one that doesn't go to sleep for 80 years?
Well who knows alternative timelines are confusing;;;