Her comb looks like it may have gotten frostbite. If that's the case then the pale tips may turn dark gradually and fall off. I would leave them alone.
How old is she? In your first picture she looks like her crop is very full, so maybe if she drank a lot of water. I would keep her in for now. See how she's acting, see what droppings look like. Check her crop first thing in the morning before she's eaten or drank anything, see if it's empty or not. It should be empty then.
Reassess in the morning based on those things, and how she's acting. If she just got cold, then warming her up and getting her hydrated may be all that she needs, but if she's got something else going on I'd make sure before putting her back out. If she's only gone 24 hours then often you can put them right back with the flock, if it's longer you may have to reintegrate her slower and let her acclimate back to the colder temps also.