It does look like a cut doesn't it. Wonder if she cut it on wire or a staple/nail or something. Maybe accidental toenail scratch from Mama hen...(maybe Mama stepped on her, it does happen sometimes).
It's good she's not bleeding anymore, the lethargy is concerning, so giving the vitamins and water is what I'd do, see if she perks up.
It's good she's not bleeding anymore, the lethargy is concerning, so giving the vitamins and water is what I'd do, see if she perks up.