These guys aren't enlightened personnel, which means while they have whatever local static jamming devices, they aren't adaptable. They didn't come to this fight expecting a newly rechristened psychic operative. With Dsci, or Spirit, Jamelia can make contact, and get the attention of spirits, encourage them to do things in exchange by appealing to them, offering them stuff.
So I'm thinking that she's under attack by a retrofitted VE saucer that looks like it's out of the eighties, and she's surrounded by Nazi hypertech from the 40's, which is like 80's hypertech more than anything she's familiar with. Her phone is jammed, while she might get a local call out, something reaching Kessler is probably not happening.
But those are just her normal routes of communication. With Dsci, however, she can maybe get something through.
This would be a Dsci 1/Corr 2/Mind 2 effect, she bribes a spirit to go find Kesser/get her attention. For in theme, maybe she finds some of the hitler youth that might have accompanied the nazi's, and on the one hand they're thoroughly indoctrinated, and on the other one of them just wants to go home. So she plays on that, talks to it and convinces it that it can go home, if only it will do a favour for her and find Kessler.
So it runs off, does that, gets his attention, and puts him in contact with her. While arriving on scene may not be plausible, having a running commentary on eighties and forties hypertech would give Jamelia an excellent benefit, letting her more accurately base her effects because she knows about specific strengths and weaknesses, and little details that might otherwise elude her notice.