My name is***** and I am glad you are trying to help this kitty.
Do you have an eyedropper or syringe? You can mix white sugar or karo syrup with water and dropper this into her mouth. Aim for 5mL of the mixture overnight.
Also, make sure that she is warm enough. About how old is she? Normal body temperature for a newborn kitten is 95 degrees. By one week to three weeks they are 95 to 98 degrees. After three weeks, they should be over 100 degrees.
The following is also a link to a great discussion on orphan puppy and kitten care.
Good luck to you and your kitten!
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Kansas State University
College of Veterinary Medicine Class of 2001