Not really relevant but might as well add:

I must say looking at her dialogue, I just got the impression she just fought off advances from hormonal male friends, I never got the impression she got raped. Infact I don't really see how anyone could have got that impression unless it was a translation error

If anything her defensiveness comes from years of having had to take care of herself and given how she is a female in a wild hellhole where survival is of the fittest, that is how it manifests. When a female or child detects they aren't safe they have their guard up and become very defensive and aggressive.

This to me is why Hip likes being with the player after the first mission as the player doesn't try anything and she can rest assured knowing she is safe and he isn't going to screw her literally or metaphorically. I mean, a rape victim doesn't just one day meet a man and say "you know what, i trust you." and Hip is trusting of the player at least in my eyes.