Wrap her sealed-closed habitat in insulating things like blankets and towels. Do you have any foam packing sheets or bubble wrap you could use to cover top, sides, and bottom? Wrap the enclosure, and make sure to cover and secure all surfaces, including underside if it is touched by air, otherwise the non-covered spots will be cold and defeat your purpose. Put tape/ropes/something around to hold the insulation close to the surfaces of the enclosure (This means don't just drape a blanket over the top with its edges loose, allowing the cold air to get in underneath it).
Be careful not to touch anything hot with the insulating materials (fire hazard).
What do you have that creates heat? Is there a way to adapt that to add in a bit more?
If it is really dire, make a smaller space to heat with what you have. Put her in her night box and make it the right temps, with water if space allows. Put her into one of those Rubbermaid-type containers with the CHEs heating that space. Put her into a big-ish cardboard box, but be extremely careful about the hot lights touching anything. It would be better to limit her space for a couple days or a week than for her to be too cold.
Be careful not to touch anything hot with the insulating materials (fire hazard).
What do you have that creates heat? Is there a way to adapt that to add in a bit more?
If it is really dire, make a smaller space to heat with what you have. Put her in her night box and make it the right temps, with water if space allows. Put her into one of those Rubbermaid-type containers with the CHEs heating that space. Put her into a big-ish cardboard box, but be extremely careful about the hot lights touching anything. It would be better to limit her space for a couple days or a week than for her to be too cold.