Cool. Put some chick feed in your hand and put it front of her, she should call the peep over to feed. Make sure there is water the peep can get too. She will show it how to drink too.
Next time she goes broody, gather eggs for 3 days from all your hens. Broody hens don't care if the eggs are hers or not they just want to set eggs. store eggs at room temp, don't wash. Put them all under her on day 3 or 4 and she will set the whole batch. Mark the eggs with a pencil so you know if an "extra" gets pulled in to the nest.