skeletons in her head

Last night Gwyn randomly asked me when our bodies became skeletons.  I didn't really know how to answer since we haven't really gotten too in depth about death so I told her "when our hearts beat it pumps blood all over our body and when the heart stops beating the body doesn't get any more blood then our body goes bad" and Gwyn replied with "and that's when you become a skeleton?"...  I just said "eventually" and she seemed content and went about her business.  Later when it was time for bed and I had finished brushing her teeth she asked me "when you have a baby in your belly and all the family is at the hospital waiting what happens when the mamas heart stops beating?"  whoa.  I just quickly said "well since the mama is already in the hospital they have machines there to help start the heart back up and get it going."  then Gwyn replied with "or she goes to God" to which all I could say is "yes, or she goes to God".  and that was it.  no more questions about it.