We have a cat that seems to do a pretty good job with the predators. I can't dig more under the porch but I can try to nab the chicken. I keep running into a logistics issue. If I lock the coop behind them do I run the risk of my other chickens laying somewhere else? Only one seems to be coming out at a time. I keep trying to navigate this between work and my two kiddos and I can't seem to figure out how to get the hiding chickens in while letting our other chickens out. And then what to do about the eggs! Are the chickens ok in twenty degree whether? I'm worried about them not getting enough food and water right now too.
At your temps I'd give up on hatching and just get the birds(is there one or two?) out of there.
Breaking a broody works best with a crate, so that would take care of both problems, confine the bird and break her broodiness...while you put something up to keep them from under the porch.
Apron for blocking under porch:
Good examples of anti-dig apron installation.
https://www.backyardchickens.com/threads/wire-around-coop.1110498/#post-17093528
https://www.backyardchickens.com/threads/new-coop-project.1169916/page-2#post-18481208
Breaking broody:
If you don't want her to hatch out chicks, IMO it's best to break her broodiness promptly.
My experience goes about like this: After her setting for 3 days and nights in the nest (or as soon as I know they are broody), I put her in a wire dog crate (24"L x 18"W x 21"H) with smaller wire on the bottom but no bedding, set up on a couple of 4x4's right in the coop or run with feed and water.
I used to let them out a couple times a day, but now just once a day in the evening(you don't have to) and she would go out into the run, drop a huge turd, race around running, take a vigorous dust bath then head back to the nest... at which point I put her back in the crate. Each time her outings would lengthen a bit, eating, drinking and scratching more and on the 3rd afternoon she stayed out of the nest and went to roost that evening...event over, back to normal tho she didn't lay for another week or two. Or take her out of crate daily very near roosting time(30-60 mins) if she goes to roost great, if she goes to nest put her back in crate.
Tho not necessary a chunk of 2x4 for a 'roost' was added to crate floor after pic was taken.