It's all very new to her. Give her some time. A peck or two out of curiosity isn't something you need to be worried about. A hen will use her beak to tuck that baby back up under her, and it can look a little rough. The chick doesn't need food or water for another couple days. If the hen doesn't get up and take the chicks to food and water once they are all hatched out and running around, you may need to move her off the next to get her moving. Just keep an eye on things and be patient. Don't rush to take a chick unless there is seriously something wrong. I had to pull my broody's chicks because she wasn't keeping them warm or protected.