ok so my young hen which i didnt even realise was laying, has gone broody and was sitting on a clutch of 16 eggs. i dont believe they are all hers and could have been there for a while, but shes fiercly defending them in a thistle patch out in the field. anyhow i took a couple yesterday to try and candle them, couldnt see much so cracked them and they were both bad (runny yellow yolk and red (blood?) streaks in. i tried another today and it was runny yellow yolk with red veins in and an embryo in the middle, but couldnt see a heart beat and it looked a bit...well... not right, fuzzy? so i fear the other 13 eggs shes sitting on are all old and shes wasting her time. i dont know how long shes been 'sitting' for as she went missing a while back and we happen to spot her yesterday/day before (hence how i found the nest) would it be worth me removing all eggs from under her and replacing with 'fresh' ones (would she notice? especially if she'd already been sitting for a few weeks?) or just leave her be and hope she gives up on the rotten eggs? is there any way i can tell if ANY under her are good? candling isnt working due to the egg colour and my crappy lamp!