What should i do about my pet duck?!?

2 days ago something got my pet duck, yesterday it got another, and toda....i dont know if my last one is safe. i saw racoon by the barn a few days ago. do coons kill/eat ducks? ok so the barn has a small room before entering into the actual barn, thats were the ducks are (where their doghouse is where they sleep and have eggs) the last one is young and her parents were killed (the ones i just talked about) in that small room the wall was kinda torn up and had holes leading to the barn. thats wat we think how te ducks were getting attacked becuase we think the racoon is in the barn. so my bf and i gt a whole bunch of cedar wood and nailed the holes closed but there are still likelittle holes biggest mightbe as big as my hand? 5+ inches in length. the racoon was pretty big. could it get through? i'm really worried about my duck. or should we just keep her outside for the night? when the other 2 were arundwe left them out a few times and they were fine, but i don know if thats a good idea just because she's all alone. what should i do? it's getting late. i took my dog in te barn to have him sniff it out but he didnt seem like there was anything in there :/