Fever medicine (injections) can be given through saline. Also sponging with cold water cloth is helpful to reduce fever. When a person is sick, the oral intake is reduced. Hence she is not eating properly. Please do not panic. Reduced intake of food for 2-3 days in acute illness is normal. Once the fever reduces, patient will feel hungry and will themselves eat orally.

S she can  bt at a very slow rate.. Better hydrate her with oral fluids and ors... If not then go for iv fluids..