When the portals are discovered they're big news. Most people can't go through them at all; only mages with certain tricks can. Then they find one that those mages can't go through.
They hire Isabella for precognition of various experiments; an hour (and six minutes, ten seconds) isn't that much but it'll let them rule things out. They want her on site rather than risking a video feed of classified material, so here she is in a cave in Florida, slapping the mosquito that would've had her itching in forty minutes, closing her eyes to reduce competing stimuli, this doesn't work, that doesn't work, still doesn't work if you try this.
They break for lunch. She gets up to join the people who are heading into town for diner food, realizes she forgot her cane, turns to get it -
- falls -
- closes her eyes and has enough time to foresee that she's not going to die before she hits the ground.