Hi! Quick question, how would you best slowly heat a reptile up that’s gotten too cold??

my leopard girl was shipped yesterday and apparently she took a different route than they anticipated and had a 6 hour layover in Indianapolis where it was 11 degrees last night!! So worried about this little snake. She is suppose to arrive in a few hours and I want to be prepared for what I need to do if she is way to cold. I really really hope she is ok...