Do you know of anyone with drastic personality changes after a car accident?

My girlfriend was in a car accident a couple of months ago, and we both agree that her personality is slowly changing…she’s more impatient; unmotivated to do anything (especially school-related work); less “warm-hearted” towards everyone; experiences lack of amusement; and she claims to experience slight memory loss. Has anyone else, or do you know of anyone, that’s been through the same thing?

We don’t know if it’s the car accident that’s making her act the way that she is, or if it’s due to the fact that it’s her first year of university, and she absolutely hates it. But whatever the problem is, it’s taking a toll on the both of us, as we both feel as if she’s changing. She also doesn’t want to (and doesn’t enjoy) the things that we used to do routinely (eg. watching movies on Tuesdays; going downtown on weekends; eating at particular restaurants that we used to always go to), as she’ll always say no when I suggest for us to go and do it. But the thing is…we don’t know if it’s university that’s making her act the way that she is, or if it really is the car accident. More so…I don’t know if there’s a third variable that I’m unaware of…

Can anyone give me any advice as to how I could address this problem?