Indeed. There's a reason Ryoko had to explain who she was after she took out her contact lenses, after all, to use an example.
...Thinking about it, it's technically not a smart move on her part. Though there's also the fact that there's evidence that this timeline is different, via some things being different in the Nexus already that occurred before her arrival (Tom wasn't there, for instance. If you're curious about the timeline stuff btw... it's mostly stuff Elf and I discussed via Skype at this point. XD If something needs to be revealed, either I or she will explain it). It's justified somewhat therefore by it already being a different timeline, but still probably not the most well thought out of moves.