I guess I would keep trying to secure the coop. Yes, coons have "hands" and in addition are really strong. Maybe put something in the coop like an opened can of cat food or tuna fish or marshmallows (count them) and keep trying your best to secure. If the bait keeps disappearing you know you are not successful. You would need to check laws in your area, but the other thing that I, personally, would do is put a trap inside the coop. And, not a live trap, if you get my meaning. Trouble is, it's probably more than one. Still I would do it if it were legal and so on and so forth. At the very least, get a snap clip or other type clip for the closure - something more secure.
She's probably going to be OK alone for a while, and if she's getting stitched up, she can't live with other chickens right now anyway as they would probably harass her to death, picking at her scabs and so on. So she'd need to be alone anyway, until she is healed up and healthy. If it were me I'd keep her alone for a while maybe in a great big dog crate, inside the garage, until she is healed and until you have been able to secure your coop and know FOR SURE that the raccoons can't get in anymore. Once that happens then you can think about getting another chicken as a pet for her.
I'm really sorry you've been having this trouble... much sympathy. I have lost SO many birds to raccoons. They are absolutely the worst, next to dogs, in my experience. I hope you can solve the problem and get your coop secure.
ETA: spellingggy errer!!