I'd suggest working on her stay command- now to me, stay means do not move until I say.
So start off asking her to stay for a second, on the lead and don't move away. Then calmly say good girl, and then give the release command (I use ok) ald move backwards encouraging the dog. This teaches them that the release command means they can move away.
Then when she is getting good, increase EITHER the time you ask her to stay, OR move away One step at a time, until you have built it up.
If you notice at any point her concentration start to lose (looking away, yawning) tep back in and reward and release.
The more chances you give her to break the stay without your release, the more likely she is to fail. Set her up for success and she willlearn alot quicker.
Also I would take her for a good run/walk or play in the garden before doing this exercise.
Another alternative would be to hold back a portion of her food and scatter it on the garden while you are cleaning the bunny out. Labs love food, and both live to use there nose and it also stimulates the brain and tires them out
