Thanks all. Super weird. Would a spider bite kill a small gecko? In clearing out her tank , which I did like a csi I found a pretty big spider.
She also has a mark that could be from a bite but I am not sure. We are having a family cremation in the yard fire tonight. I haven't lost an animal in a long time

Her diet was clarks gecko diet and the odd few day old dubia. The breader told me this was perfect. I misted twice daily so she could drink from the leaves as well as had a water dish. I figure it's most likely she had a medical problem like a heart or organ issue.