Broken Nail

Was doing bunny's nails today and realized she had broken one off (one of her "thumb" nails). It must have happened a while ago. Right now it's very short and there's a bit of nail (maybe a couple millimeters) and then a dark part on top (slightly longer) that isn't nail—looks like maybe the quick scabbed over? I never noticed any blood and she hasn't been walking differently and it looks older. Is there anything to do? Will the nail grow back?

It should grow back, just keep an eye on it to make sure it doesn't get infected.