Sometimes you find a drake or cockerel will have a 'favourite' and so you need more females to dilute the attentions. I find that their attentions usually start to calm down a bit later into summer, so around July they aren't quite so brutally affectionate
Just for the record, limping is sometimes a sign that they need wormed - Flubanvet in their food usually makes that right in a few days. Sounds like this is the drake though.
Hope she's well