I think its commonplace for a lot of retics to have banged up faces. Maybe not good, but a common occurrence for a lot of them to exhibit some goofy mouths.
Hey, just FYI, I gave Wallace a bath tonight to get I'm to Pee and he was breathing hard the rest of the night. I don't think he particularly liked his bath experience. I saw him loading up toward me for a strike so I used a shampoo bottle to break his aggression, I got two nice, wide mouthed threat displays after that.
He was making heavy breathing sounds with a slight whistle after being wet. I think every snake I've put in the tub has made those same sounds.
I doubt your husbandry is off, but I would like to see how she behaves with a 76-77 degree night drop from 22:00 Hrs to maybe 08:30 the next morning.
Personally, I can't see how anything is off as you've had such a wonderful first year with her.
Also, after a bad strike, Ive had both the royal python and the boa here, have screwed up faces for a couple of days. The royal was the first snake here when we got it for our son. She had me concerned because her lip was folded in after a weird strike. It went away in 2 days.
I think the pushing coupled with possibly, a not ideal strike could account for the swelling.
Keep and eye on it, but I'll bet a good meal and a new cage will help.