Rotten "so and so" killed 5 chicks

[omelette'smom]

She's up to 5 kills. I know she's just protecting her chicks but I hate her anyway. I have two mom's and a total of 5 hatchlings under 2 weeks old have made it into the other coop. One got through a gap of about an inch and a half that I fixed. Now yesturday 4 went UNDER the door. I am horrified! One of the chicks I was going to keep as my own. My hen pecked them to death. I have a threshold for the door and for some reason they got curious and went UNDER that to get through! I am wondering if maybe a chipmunk made the "tunnel" for them or if mom did while scratching away. Either way...they're gone. I keep adding safeguards and they act like suicide experts. I tried to make the other hen mom to all and kick out the agressive one but that didn't go well. The other mom did one peck at a baby and it was "ABORT MISSION"!
So when can I trust the hen to stop being so overprotective? These chicks were hatched between the 15th and 23rd. How long will they need mom to keep them warm outside? Thank you!

 

[warmwater]

Hi, I'm no expert but I would take the chicks inside and put them under a light until they get older. I say better safe then sorry. You can't really blame the chicken....it is their nature.

 

[PeepsInc]

My friend,who's raised chickens for 36 years, always hatches under a brood hen. Then puts the hatchlings in a brooder for safe keeping..............................I owe him all the thanks in the world for the 3 dozen eggs that got me started again. Thanks,Jerry