Not that common or uncommon
Just make sure you have no doubt that she will be OK.
First timers should be old enough, big enough, and you should be golden.
There was a thread not to long ago of a BP that died egg bound but her clutch seems to be doing well last I read. They dissected the eggs out.
I would die if this happened to me.
I couldn't imagine losing one of my baby's.
http://ball-pythons.net/forums/showthread.php?t=173068
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