Obviously she's interested in the portals.
So when one of her mage friends texts her complaining about how excited he was to get to try out a new portal, and how disappointed he is that he can't get through it -- and then updates her, six hours later, that the next two mages to try can't either --
-- well. She's intrigued.
So she drags Zari into the car and drives at ninety into Nowhere At All, New Mexico, and bribes people and flutters her eyelashes and convinces one particularly credulous guard that she's from the Federal Department of Portal Inspections, and gets herself a look at this portal.
It doesn't look like anything at all, of course.
Jeanne is undeterred by this. The files that Zari got her access to say that the portal is actually ten feet off the ground; the stepladder's presumably been put away when the people who were legitimately here went home for the night, so she gets Zari to telekinesis her up to where it should be.
And then the telekinesis abruptly cuts out and she is falling. And also somewhere very different.