Wild Baby Bunnies Help!!!?

My daughter was weeding around our pool. There is a slope/bank around the pool, and when she pulled out a giant weed there was a flat surface. As she was using the surface to hoist herself higher up the hill she heard a whimpering sound, she immediately got off it and a baby bunny popped out! it started rolling down the hill so she grabbed it and put it back in the hole. Later this evening a wild cat came and dug the nest up and ate 2 of the 3 before my daughter could chase it away. she grabbed the third and has it in a plastic tank (hermit crab cage) with a lid on top with holes in the lid. What should she do to get the bunny back to its mom?