Someone closed the other thread. . .
The other post satirically discouraging you to proceed is true but said harshly.
First, good news for your case. Libel or Slander can be regular, or per se. If defamation is per se, you are entitled to automatic damages without having to prove specific harm (such as proving you got fired from a job). Defamation per se is committed by telling others you have committed a crime, hurt your business, or have a loathsome disease. Since she accused you of rape, that would qualify as slander per se. I am assuming everything you said was true, she appears to lack any moral or ladylike quality and is now accusing others of crimes to pretend she is still virginal.
The bad news: It is not enough to be a false statement, but she must know it is false as well (or she must be recklessly or negligently saying it). It is conceivable she actually thinks she was harmed, females being paranoid because of their physical weakness. If so it is hard to prove that she doesn't actually believe she was wronged, and hard to prove she wasn't reckless, since she did wake up in that situation, and probably thinks it was good of an opportunity for a male to miss his chance.
Worse, she hasn't harmed you enough yet to justify your suit (See the original reply to your old post). Getting you kicked out of a bar isn't enough to make it worthwhile. However if she appeared at your job with a giant sign calling you a criminal, then you got fired, you would then have a case against her.
Also, it isn't necessary to lose $20,000 and 3 years to sue someone. You can sue and get an injunction which restricts the defamer on what she can say (so called gag-order). If she keeps accusing you, she would be fined and held in contempt of court. Note that this is rare and courts dont like to restrict free speech.
As to this site, yeah, the quality of discourse is very low. I am only using it for practice in learning legal principles. Try
http://community.lawyers.com/ next time