One thing I've learned with pecking-order problems....if it's done to one chicken, it's done to all.
So, for a chick with splay-leg, ALL the chickens got vet-wrap and band-aids on their legs.
For a hen who was pecked - EVERYONE got bluekote on them somewhere, some tails, some wings, some combs, some feet....just a spot 'o blue on everyone!
Had a hen who had bumblefoot - EVERYONE got shoes (went through 3 boxes of band aids on that one!)
Yes, it's very time consuming (flock of roughly 30, give or take). Yes, it can be expensive (in the case of the band aids!) But it's well worth it in the end.
Best wishes to your scalped hen. Sometimes, a hen will have a medical issue which is unknown to us humans, but the birds know when someone is sick and they try to 'solve it' by themselves. This has been the hardest lesson to learn for me. Try separating her, try treating EVERYONE with bluekote, but know the flock knows something's up with this girl.