Yes, hard boil up some eggs or scramble them, chop and serve warm. Don't leave any egg laying around in the brooder, the heat will make eggs grow bacteria, so clean up after then each feeding. Eggs have all the building blocks of life and can be fed exclusively for extended periods of time.
Hello and welcome to BYC! :frow
17 days is a long time, she will probably break herself soon. I'd wait to give her eggs at her next spell. Best wishes with your flock!