Maybe try a live fuzzy mouse to kick start them eating. My 6 week old high white pied girl was classified as a "problem feeder" at the pet shop but after I got her set up and all nice and warm she ate 3 live fuzzy mice after 2 days. They were small for her but it got her "jump started" to eating and now i'll bump her up to hopper mice or I might try a rat pinkie as I'd like to get her on rats early.