Oh, trust me-you'll know! She will not get off the nest for anything and she'll fluff herself up and practically hiss/growl at you if you go near her! lol Let me find a helpful link for ya!
Good luck, mine just hatched out six eggs! I tell ya, it is a heck of alot less stressful with mama (providing she's a good one, of course!)than a dang bator! lol