Exit with NOC

My friend found a better job and the company is willing to hire her. Her present company is willing to give her NOC but problem is they want to cancel her visa first and not transfer directly to new sponsor (don't know what's the logic of this procedure). New sponsor though is willing to send her work visa once she exits Qatar, so definitely she can come back. My friend has an outstanding bank loan. QUESTION IS, if the sponsor now cancels her visa, can she leave Qatar? Will she not face any problem in the immigration? She is by the way has a good credit standing and never failed to pay her monthly amortization.