Snake suddenly showing aggressive behavior

[Bogertophis]

She is not the "sweetest baby"...she's a snake, with an appetite, instincts for self-defense, & the potential to be confused by human actions, none of which make any
sense to her. But she's not the only one that's confused...

Snakes do NOT identify things much by vision...they rely on their heat sensing pits, and senses of smell & touch. Vision gives them an over-view & they basically assume
that a creature coming towards them is either prey or a predator. When a snake is hungry, they should be forgiven for assuming optimistically that whatever's incoming
is prey, and that is NOT aggression...it's you being unwise to move a hungry snake to a bin to be fed. You are warm and wiggling, just like their natural prey. You are
asking for a bite.

Always feed snakes in their home enclosures...it's less stressful for them (any handling can cause shy snakes to refuse food!) & you invite bites both before when they're
hungry, and after, since snakes may stay in "feed mode" (ie. ready to bite anything warm & wiggling) for anywhere from hours to a day or longer. While you may have
gotten away with doing this is the past, your snake has grown up & now has a bigger appetite...you're just asking to get bit. With larger species, trying to handle them
when they're hungry OR after they've eaten can be dangerous.

My strong suggestion is to buy some feeding tongs (if you don't already have them) & feed her where she lives. She's not 'aggressive'...she's a NORMAL snake.