I'm guessing that she's egg bound. It's a reach, and probably too late, but you might try taking her inside and giving her a very warm bath with Epsom salt in the water. This will bring her core temp up. Feel around her vent to see if you can feel a bulge which would be an egg. If so, perhaps you can massage above the egg, and help her to work it out. As she's cold and not responding, I'm guessing she's in shock and her body is shutting down, so it's a long shot. If the bath is successful, and you are able to help her pass an egg, you'll have to dry her off, (a lot of people use a hair dryer) and keep her inside for the night. If you can get liquids into her, electrolytes would be best, you can do a google search on how to make some, or pick up a jug of pedialyte in a pinch. Good luck. Don't own any guilt trips if she does not live. BTW, I have never personally dealt with this problem, just read responses from folks who have.