i agree with those above. however, if you simply want to patch this for your friend? you can tie chicken wire behind the rabbit wire that's there and use sakrete mortar mix and trowel it on the holes, use a rubber trowel to smooth it out similar to what's there. don't mix it too thin so will hold onto wire backing. I doubt she's losing heat there, this isn't a conditioned area, though a lot of cold is going under her home. the cats are a separate problem. tie your chicken wire tight and flat as you can. your patches will probably still be there when the rest has frozen thawed over and over and popped off
good luck
Larry/coupe
good luck
Larry/coupe