It appears to me that one or more of her teeth are caught on other tissues inside her mouth- surely your vet completely opened her mouth when she was seen?
The main thing is to carefully help the snake get their teeth unhooked, as gently but effectively as possible. I've had snakes do this before- it's been a long time & I think it was when I had BPs (which I no longer do)- they have fairly long teeth & "big mouths" & seem a little prone to doing this.
Sometimes you can get a small blunt tool (like a wood popsicle stick) in their mouth behind the teeth to unhook them. This is why snakes often yawn before & after they eat- to get their teeth back in alignment- but sometimes they still get in a fix.
When they strike their food, a few teeth may be loosened & knocked sideways- causing this trouble. Sometimes an offending tooth may actually end up poking right thru the snake's jaw (visible outside the snake's face), & necessitating removal.
It's possible, if this is ignored, that your snake will get an infection & swelling from this- obviously, that is best avoided with prompt treatment of the teeth. If your snake had such a swelling* & antibiotics, & now it's recurring, it's possible that an embedded tooth was never removed. Unfortunately you might need vet help again, & you might want a different opinion. https://arav.site-ym.com/search/custom.asp?id=3661 *FYI, snakes have mostly solid pus, so if an abscess forms, it usually needs surgical help to drain.
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