Fermented Apples... uh oh... what did I do?

So today I went out in my wood house and found that one of the bags of crab apples my husband had collected had obviously gotten moisture in it and rotted quite badly. I took the bag out to the compost heap and went about my chores. Then I went to work. It wasn't until half way through the day I suddenly had a thought... what if the apples fermented and the girls jump in the heap and eat them! Did I just kill them?! Will they be okay??? Maybe just a little hung over? I have two or three of the flock that love getting in there to see what goodies I have in there which I don't mind, I know they want the bread and the bugs and we've never had an issue before but it suddenly dawned on me that now they might have alcohol poisoning!!