That would be "telling."
Truth be told, I'm going to bump into canon a wee bit with this one. (Bend, not break) I reviewed the script for "Identified" some time ago (Thanks again Deb) to check a few of the facts. First, to your question, it isn't clearly stated that Ginny has never seen a UFO in action, although one can make that assumption. I do, so I do have a way around that issue, as well as another which will appear later in the story.
The other issue, and this one is a huge plothole, is, how in the world was SID able to track a UFO using standard RADAR at SOL 8 when the Utronic equipment has not yet been delivered? The UFO would be traveling faster than it's own RADAR echo. I solve this in my story lines by making the following assumptions.
1. The aliens seldom fly a direct course to Earth, rather a circular course such as the classic Hohmann orbit used by deep space probes. This reduces the relative speed to Earth to below sublight. It also explains why the interceptors missed in "Identified".
2. The SHADO tracking system was integrated in stages with most of the key components being software based. The equipment that Seagull X-Ray carried in "Identified" was most likely improved sensors for Moonbase, and the final release of the system software and firmware which could be uploaded into the system.
We also know that Straker said to Freeman that there had been a few UFO sightings, but no interceptions. I'm assuming that he meant since Moonbase and the rest of the tracking network went live. That leaves the pre-SHADO field wide open.
More to come, hang on to your hat!