Cool illustration, Evenstar! It's fascinating to see them open up sooooo wide!
I've had a minor freakout about jaw misalignment too, my Dumeril's did exactly the same thing as Ruby. Similar situation with her, too. Her previous owners had been feeding LIVE hamsters and gerbils all her life, which were way too small for her. She also received some nasty bites from the hamsters before she came to me.
It took me 1.5 years and literally EVERY SINGLE TRICK IN THE BOOK to get her to switch to f/t, now, she eats the very biggest rats I can get (retired breeders) and will be moving to rabbits soon.
But anyways, she did end up having her lower jaw stuck in behind her 2nd row of teeth (or something...couldn't quite figure out what happened) and I had to get my boyfriend to hold her up while I released it. She probably would have got it eventually, but it had been a couple hours and I didn't want her to go burrowing and get a mouthful of aspen to add insult to injury.
Glad Ruby is okay, and let this be a reminder (pff as if we need one) that snakes are such fascinating creatures!