Thanks for the tip.
I've resorted to an indoor automatic spray thingy - one of the natural plant based ones - to hopefully keep them away so just have to try to get the ones she has healed. Luckily today I was able to dress her in long pants so she couldn't get to them but she didn't appear to be wanting to itch them either. DD has a cold at the moment so she wasn't a happy girl but at least she hasn't attacked her legs. I've kept applying Betadine as it's supposed to dry them up and promote healing but see how it goes. They're quite yucky looking so i doubt they'll heal fast unfortunately.

Anyone know what i can use to try to prevent scarring?