pecking crown!!

My poor red hen is getting her crown pecked by my bossy white chicken. Its nothing extreme but she has now got a small scab on it should i put some petroleum jelly on it or something else? to be fair she does stand her ground with the big bossy white so i think she may have asked for it 

it only very small and is scabbed up well and doesn't look like anything to worry about but yes i will keep check of big white like i say the little red hen is pretty cocky and will steal food from the others and her and the white one haven't quite decided whos top chook yet. Thanks