It was my fault

I cleaned out the garage today and thought I would clean out Alex's (our bunny) cage. I cleaned it all out, and he was on the leash enjoying the grass. We moved the cage near him so he could get some water if he needed it...and the girls went ahead and shut him in there. He was on the porch in the shade doing just fine. Until the sun moved to the porch. The 105 temperature baked the poor bunny. Gracie came in holding a stuff bunny saying "Alex died". She has cried ever since. I have tried not to cry, but I so want to! It was my fault!! I feel like such a bad mama!! I knew better. I KNEW that would happen. But a friend was here, and we were talking, and I totally forgot about Alex. I forgot. I killed our pet. :(