There is a difference between NOC and release. What the poor girl is asking from the sponsor, a release or an NOC, is not clear. It makes no difference to a company to offer its employee an NOC besides losing the employee who happened to be useful (not true in this case). Not giving an NOC automatically means that the employee has to either stay with the company or take a karwa to the airport. Why would the sponsor like to do that if the employee is no more useful (as in this case) to him until he is really not human enough to be able to react to the tragedy the girl underwent in a courteous manner.
I think the girl is looking for a release which establishments don't want or can't give to their employees at will due to visa restrictions and allotted quotas for certain nationalities.
Another question that comes to mind is, how did the girl survive all these months without being able to work while staying in the payroll of the company. If true, that suggests that the company is not 'cruel' to the extent that it is refusing a humble NOC.