In known HIV exposure cases (needle sticks from an HIV positive patient, or sex with a known infected person) you can go on Post Exposure Prophylactic (PEP) therapy. This involves a course of 2-3 HIV anti-retrovirals for up to 10-12 weeks. The meds can be quite toxic and have some nasty side affects.
However, you probably don't know the HIV status of this guy. The reality is (despite what HBO specials and The View would have you believe) the rate of HIV incidence in white, non-gay, non-IV drug using individuals is very, very low. If your girl has no existing STDs then the rate of transmission would be even less. If there was no rough sex and adequate lubrication was used then it is unlikely any vagianl tears occured, again a good sign. Even if he was HIV positive, the transmission rate in a single exposure situation like this one is very low.
I can't tell you not to worry, or even what to do. However, the odds are hugely in your favor that she will not get HIV. Other STDs - who knows. PEP needs to be started as soon as possible to prevent cell-free virion from reaching the fusion stage of the HIV life cycle. If the sex ocurred more than 72 hours ago then you are almost past the point of using PEP, so the decision is then made for you.
If you want to be safe, then you should practice a barrier method of birth control with her for at least 6 months and have her tested at 3 months, 6 months, and yearly after that.
The only other advice I have is that semi-conscious sex with an unknown partner is risky. Even 'safe' sex can go wrong in that situation. Play safe.