I think I used a dremel tool to cut hole in plastic jar...thin fluted cutter bit.
No vaseline here......before or especially after....hands off, it'll heal on it's own.
https://www.backyardchickens.com/articles/frostbite-in-sw-michigan.74597/
I was just curious about the damage to her vent as it could be a deal breaker for recovery.
Good that she's eating/drinking/pooping.
Agrees with @Texas Kiki ..she should have water available at all times.
Hard to have a dish of water in a crate tho, they always spill it...glad I went to...