If most of the top is covered except that corner (?) many snakes are simply attracted to the influx of "outside" air...the scents are enticing, & being in a cage
is probably boring by comparison.
To help preclude any damage to my snake's nose, I'd probably cover that corner & instead use several tinier holes (in a different location) for the air-flow.
Snakes learn their way around, & without change, she may just keep pushing until she gets an abscess on her face/nose. Best to prevent if you can, snakes
can be stubborn.