There is so much mental damage and permanent scaring caused by rape.  I know there are rape crisis centers and counselors that can help.  I think encouraging her to seek professional counseling would be beneficial.

Your friend needs counseling.  I'm sure there is a rape crisis counseling center in your area if you live in any major city. If you can't locate it on line the local hospitals and police stations should be able to help you with information.

Dear ME_SO_HORNY,

Your friend should get the name and number for a rape crisis center. If there is no crisis center in your area, then she should go to check herself in at the nearest mental health facility for the next 72 hours. If she is in active crisis, she will need qualified mental help.

Another avenue is contacting RAINN (see link). They may be able to help. The link attached leads directly to a search engine where she can look for a center in her area.

Extremely unfortunate and deplorable incident,
The Love Goddess

did she screen the client? how old was the client? and where was it at? and how does she posts her ads?

Re: I NEED HELP BAD........

I said and done the wrong thing.

Thank you, friend, for starting this.

Love Goddess, please PM me....

Either the hospital where she was treated or a local women's shelter should have contact information for appropriate counciling.  She may need someone to get the information for her & to take her there.  
There are many men here who care deeply about our lady friends & it is upsetting to think that some creep would harm one...    
Thank you for being there for her.  I have never been through this so I truly do not know "what to say".  I was, however, pretty messed up with a combined bankruptcy / divorce.  What you do is listen.  You act as a sounding board as she works through this for herself...  it will take time for her to work through this.  Typically if things don’t make sense when we try to explain them, we realize it ourselves.  
Do NOT judge her.  Do NOT try to tell her what to do.  She may need to DO something but offer everything as a choice.  She WAS powerless.  She now needs to TAKE CONTROL of her life, one baby step at a time.
I did get professional counseling.  The forgoing does not REPLACE professional counseling but rather supplements it.  
Thank you for being her friend.  Right now, there are d*mn few she will be able to trust.
skb

What they said (about rape crisis counselling).

Being a friend, you'll sometimes say things your friend might have a hard time hearing. Try not to be too ginger, but also be patient. It's a tough line to hold and you'll stray to either side ALL THE TIME. Better to be engaged with your friend with love than to say nothing out of fear of saying the wrong thing.