Was thinking of stitching this wound- what do you think I should do? Will this heal by itself?

One of my hens- about 2 1/2 yrs old, got attacked on the chest by a hawk about 10 days ago while I was out of town and my neighbor scared it away. My housesitter put peroxide on wound and kept her separated until I returned. 4 days later I came home and examined her and poured thyme tea over the wound (which smelled bad at that time.) I couldn't tell exactly what was going on with it. There were hardened pieces of skin and feathers hanging. Today I poured more thyme tea over it again and this time it did not smell bad, but I definitely see a hole about 1/2" diameter in her upper chest-THE CROP?- and can see partially digested food coming out of it. She is eating and running around and laying eggs, but I don't see how this will heal itself. Would stitching it closed help? (Is it too late?) Any other suggestions? Is she likely to survive this? Thanks for any help.