There is plenty of evidence that Marita has been kidnapped and forced into prostitution. In other words, she has been sold as a commodity and used as a sex slave.
Even though Susana received several death threats, she never gave in to fear. As a result of her search, she discovered a criminal network of Human Trafficking and, over time, she was able to release hundreds of women and girls.
Important note: this is not an isolated case. Forced prostitution and human trafficking are real ongoing problems that exist not just in developing countries but also in the United States and Europe. Here's a link to clarify some misconceptions: http://www.ksmm.admin.ch/ksmm/en/home/themen/menschenhandel/irrmeinungen.html