I don't think you need to do anything to the comb. Looks like blood flow is adequate and it will be fine. If it was severe then a part might turn black and eventually fall off, but it doesn't look like that will happen. I wouldn't do anything to it. Given enough time, it may not really be...
I don't see any obvious signs of infection. Watch for swelling (the trauma will cause some swelling-should decrease as it heals), any bad odor. Being on the head it should stay clean, so it probably will do fine, just make sure it doesn't get pecked. This link has some pictures of a bad wound...
Hardware cloth is actually metal mesh, see below. Many places sell it, comes in various sizes, widths. 1/2 inch squares or smaller is best for chickens.
If you can get some 1/2 hardware cloth and put that around the bottom of your wire, that will prevent them trying to stick their heads through. Maybe some pictures of your set up will generate some suggestions. Chicken wire is not really predator proof either, so that may cause heartbreak in...
I would use veterycin spray or plain neosporin on it. It will likely heal up OK. Combs can bleed a lot, so may look worse than it is. You do need to protect her from pecking which will just make it worse. They are very attracted to red/blood, so if that's visible the other just will peck at...