Hi Tommy
Have a look on the Gundog Club
http://www.thegundogclub.co.uk/index.htmlThere are a lot of experienced spaniel people on there and a lot of people who have had similar problems with cockers and springers.
I have HPRs so am no expert, but the perceived wisdom with spaniels seems to be NOT to allow any free hunting at such a tender age. Get the recall trained in and get a stop whistle that is !00% plus rock solid regardless of distractions. That means in the rabbit pen too. :-) Get the quartering pattern sorted with a good change of direction and don't allow her further than however many yards away from you that you spaniel folk like your dog to work!! (Under your feet isn't it? :-D) Once you have all of those in place you'll find that you will become the apple of her eye as you can then 'lead' the hunt and take her to where all the gamey ground is (or not as the case may be!!)
Good luck