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Only 3.5 million people in the surrounding area witnessed it.
So regardless of the camouflage techniques they used...no one noticed at all.
My personal fave..."apt-get install clue", priceless.
Seriously though, don't they make paperback dummies guides for this kinda shit now-a-days?
http://www.websdr.org/ - MANY web enabled SDR rigs with a java app that includes a waterfall.
http://software.muzychenko.net/eng/vac.htm - Virtual Audio Cable software to make audio from previous app available to a lot more apps.
http://members.storm.ca/~ve3iay/digital.html - Some examples and basic info.
This will get the ball rolling in increasingly complex modes of transmission...then you begin to throw in real complexity by going over how some of this good old tech was made into the modern internet. Remember this is where the TCP in TCP/IP came from. If your area has an active VHF packet network that will keep her busy for a few years at least. There is a BBS on the space station she can use too (callsign RS0ISS-11, AR1SS, RS0ISS-3).