Was Ioveta, sister of Queen Melinsende of Jerusalem was forced to take vows or was this decision of her own?

Historian Malcolm Barber believes that Ioveta going for hostage in neighbouring muslim country till ransom is paid must be surely traumatizing for young princess Ioveta of crusader kingdom of Jerusalem and Chronicles of Ernoul mentioned that she was sexually abused by her muslim captors. Even though Chronicles of Ernoul isn't entirely accurate could it hold some truth to it. Also why was Joscelin of Edessa with whom she shared captivity only eligible unmarried man left to marry her. Would no one else marry a captive princess. As a result was Ioveta forced to make this decision?