Ok so we had got to the point where Eabha would now pick up a ball and put it in my hand, the next stage was actually getting her to retrieve, I thought this was going to be much trickier but to my surprise she had already got the hang of the whole thing and began retrieving straight away. Once I had her fetching the ball confidently and even showing enthusiasm it was time to take it outside, for the whole of week two I spent 20 mins per day on a field with a box of treats a ball and Eabha, she would happily retrieve as long as I didn't throw the ball too far and as long as there weren't any new sounds/noises/people/dogs! Her confidence began to grow and the time came to hand her back to her owners. I was a little worried she may have to go back a few steps when doing the "routine" for someone else, but no..she was a little star and looked much happier than she ever did with me! 
Well done Eabha Diva, fingers crossed you'll be flyballing this time next year!