I'm no fan of Islam, but this is not a fair criticism.
This is very nearly the exact opposite of what Mohammed put in the Koran, which requires the testimony of four Muslim men to convict a woman of adultery. It was intended to provide protection for women against such charges.
This is not the way it is often applied in the Muslim world, but that's due to misapplication of the Koran, not the Koran itself.
Reference?
What I have found supports what she says:
http://www.thereligionofpeace.com/quran/002-rape_adultery.htm
Summary Answer (detailed Quran references follow at above link):
“Under Islamic law, rape can only be proven if the rapist confesses or if there are four male witnesses. Women who allege rape without the benefit of the act having been witnessed by four men who subsequently develop a conscience are actually confessing to having sex. If they or the accused happens to be married, then it is considered to be adultery.”
http://www.thereligionofpeace.com/pages/myths-of-islam.htm
“If a woman wants to prove that she was raped, then there must be four male witnesses to corroborate her account. Otherwise she can be jailed or stoned to death for confessing to adultery.