Firstly, your implication is clear - that someone subjected to serious sexual assualt would not be able to, nor would they wish to keep such an assualt secret. I would like to see upon what you base this belief. Secondly, you have no details of the assualt - other than the fact that it was alledged to have involved a number of men. As such on what basis do you claim that all rape victims subject to assault by a number of men would be "in urgent need of medical attention (implying injuries so severe as to preclude covering up such an incident)?"
Ok, a quick look shows that the two things most often associated with serious injury are youth of victim and multiple offenders:
"Amount of aggression and degradation increases as each person takes “their turn”"
Forensics Talk
"Lack of sexual experience in adolescence and menopausal changes and less frequent intercourse in older women may account for prevalence of injury at both ends of the age continuum."
and
"Single perpetrator rapes were more likely to have no injury documentation than multiple perpetrator rapes" from
Medscape
There's an awful lot of reading in
this and
this, both from University of Georgia (USA), which indicate that reporting likelihood increases with both the youth of the victim and multiplicity of assault.
While those don't preclude the girl from being uninjured or not reporting it, it makes the combination of both highly unlikely.
Add to that: what is the likelihood of a 57 year old (and therefore unlikely to be newly-graduated/qualified) counselling professional coming to the JREF forum for medical advice? Very low, I suggest. In the same circumstances, I would be talking to medical professionals, not a bunch of forum-dwellers.
Overall, I feel that for the OP to be true we have a statistical possibility around the same level as Flight 77 having not crashed into the Pentagon and all its passengers being held in FEMA camps while the Pentagon was hit by a missile or Lear Jet packed with cordite.
Yes, it's possible, barely, that the OP is true, but on that basis, so is the Invisible Pink Unicorn, the Tooth Fairy and god, but I don't accept them either.
(I'm certainly not saying that victims don't want to cover the crime up because they clearly do, with a majority of rapes going unreported.)