As long as it's ONLY a dent (no blood or oozing type of injury & eye is functional to the best you can see) I wouldn't bother going to the vet- there's nothing they can or will do, AND I agree with Hugsplox on this, that eye dents are generally the result of dehydration, & it's possible you just didn't notice it until she was dropped.
In this case, it's possible that she also bumped her eye in this incident, but if her hydration is good, her eye should also be popping back out on it's own...I just can't tell you how long that might take- it could be days or months- but I'd keep the humidity up until it does, & if you're feeding f/t, feed them damp if she'll accept them that way. Make sure to replenish the humidity in her "humid hide" also, as they do dry out. In my experience, BPs seem to be prone to dented eyes (or maybe I should say prone to dehydration) & at times, their large eye-caps just seem to be "asking for trouble".
Also, don't "boop snakes on the nose" or allow anyone else to do so- they hate it, & so would you & I. It tends to make them even more head-shy than they are naturally- it's just plain rude. I wish they'd all bite anyone who does this, actually. If I was a snake, I sure would.
