Is it better to tell someone they were raped, or keep the information from them (see details)

If a girl was completely unaware that she had been sexually taken advantage of during a blackout- would it be better to:
1. Tell her because she needs to get medical attention (or for any other reason)
Or…
2. NOT tell her and help her avoid the emotional trauma that would most likely follow?

I was following another thread—it brought this question to mind and I didn’t want to derail that thread, so am creating a new question. I realize many factors might come up, but am curious what others have to say.

This is only for rhetorical/discussion purposes, nothing else—I’m not asking for any advice :)