I wouldn't take the chance, especially if they've never raised chicks of their own before. If you do decide to try it, only offer her one or two. That way, if she starts pecking them, it'll be easier to stop her than if they're scrabbling everywhere. If she does good for the first few minutes, watch her for at least an hour. She might not notice them yet or they're not appearing as a threat yet.
The more you add, the more threatening they'll be. Depending on how many you have, they may frighten her, which isn't good either. (I've had hens scared off by chicks before.)