sounds like you need to get the recall sorted first mate, get that up to scratch all the time then try with the bunnies.
do you take her out alone? or is there other dogs present? could be worried that the other dog might take her catch off her.
mine was like this and it got better when we started lamping at 12 months, to begin with he would run off with it, if they do, lamp off walk away back to car or whatever giving the recall command, end the fun so to speak. eventually when she comes back with or without catch, start lamping again(try find the catch first), you need to get her to