I don't think you can force feed dry food. It would have to be wet food, watered down a little. You put it in a food syringe, open the cat's mouth, and shoot it down her throat. I have done this many times with a cat who was ill and recovered an amazing number of times. She lived to be 22. My trusted and very experienced vet tech told me that when a cat stops eating, it becomes anorexic. Your cat may simply have fallen into this habit. I agree with the person who posted about tempting the cat with other foods. My vet tech said that you give the cat anything (safe) it will eat to stimulate its appetite. I suggest tuna water, cheese, or a small amount of milk or yogurt. Once the cats starts eating again, she will eat her dry food. Hills Science Diet A/D is a nutritious canned food that my cat ate even when very sick. I would try that. A large weight loss can be caused by thyroid disease. You should try calling the vet and talking to a vet tech. You should be able to get some free advice that way. If you explain your financial situation, they may just do the blood tests without charging an office fee. I think most vets understand how hard it is for people to afford their fees right now. Best of luck!