Yeah, your dog may pass it with no real problem, or may not have even ingested it, if they ran off with it and you haven't seen it.
Keep an eye on her stool to see if it has any blood in it.
The main danger with chicken bones is that they can shatter easily, and the shards can be sharp in a dogs belly, or in their mouth and cut them.
If they continue to be lethargic or sickly, then take them to the vet.
Chances are if your dog is tired, they may just have exhausted themselves the day before. My dog does this, having hyperactive days followed by days where he just wants to lounge around.
I also advise that you avoid scraping food off into your bin in your room, or leaving it at a height the dog the can get to.
A nice tall kitchen bin is usually best, with a lid.