Is it okay to ask for a raise to compensate the pay loss with my demotion

My husband is in the military and a few months ago we were told that we would be moving in April. So at that time I had put in my notice at work so they can find my replacement. I was full time and the official trainer of my work place. Two days ago my husband found out that we will not be moving that it will be delayed. But when I talked to my manager about the situation and that I qould need to stay employed for longer she began to tell me that I would be put back down to part time and my title as the trainer would be revoked because they hired someone. Is it okay to ask for a raise to compensate the pay loss with my demotion?