i've dealt with lots of different experiences in my twenty years and so have some of my friends so this topic is close to me. as a friend you wanna be the superhero that comes in and makes everything okay, that's what makes you a friend, caring about them. however the reality of the world is that some people take a long time addressing their own issues, some never do. if it begins to look like you're friend is completely ignoring something that has affected her, consider discussing it further. on the other end of the spectrum, some people are just strong by nature. my friend mae brought home a date that tried to rape her then, after he left, she realized that he'd stolen half her rent money. the next night we were at the club voguing to house music. some people have the natural strength to not let bad situations that affect them. even situations that seem overly traumatic or damaging. if what happened to mae happened to me, i'd have pretending every thing was okay (one thing people are good at is pretending everything's fine, that's why suicide is sometimes a ghastly surprise) but internally i would've developed severe paranoia and stopped dating for a year. i don't know your friend so she may be strong, she may be surpressing it. continue observing her,, as i'm sure you'll do because you sound very caring, and when you think you have an idea of which side of the fence she's on, take further action (or none if its not necessary).