R.I.P. Hazel

Sad to say that Hazel passed away in my hand at 3:31 am early this morning.
She died peacefully but I am heartbroken for her sister and feel like a failure.
I am putting up my squirrel whisperer shirt for a while and taking Coco to Wildlife Rescue, although they don't usually take squirrels who are still on the bottle...
I don't have any answers as to why, only that she was the runt of the liter.
She's headed home to the big tree in the sky.