As some of you know Diamond was attacked and it has set her training back somewhat

I had a 2hour convo with they lady who runs the local classes and she suggested that I take Diamond off the Gencon and put her on the Beaphar Gentle Leader with a buckled collar as this will help combat her reaction to other dogs better. It will also help keep her nose down, where as the Gencon tends to keep it up. She also suggested giving Diamond Dorwest Skullcap & Valerian in her food - Just wondered if anyone had any experience of either of these?
Oh and yeah (the point of the thread) Diamond starts training classes in May! The lady asked me to call her a couple of weeks before hand to let her know how Diamond is getting along with her recommendations prior to starting (I'm guessing this is normal practice)
Thanks
Amanda