Welcome to the site!

She holds onto the mice for 8-10 hours? If that's not a typo then there is something wrong. Also are you sure on the age? That is really small for a snake that old.

Is this a consistent issue, or are they isolated events?

Can you give us some info on your husbandry?

  • cage type/cage size
  • heat sources
  • temperature measurement devices
  • current temperatures/humidity
  • any thermostats being used
  • substrate
  • etc.