When Hollow Girl encounters a player, she reacts based on their state:

• If the player is not cursed:
  Hollow Girl throws a projectile that applies a curse upon hitting the target.
  The projectile can bounce 0 to 2 times off walls or the ground. On its final bounce, it explodes into a cloud of smoke that curses any player who comes into contact with it.
  The projectile can also be reflected with a shovel if timed correctly. If the reflected projectile hits Hollow Girl, she becomes cursed without entering her enraged state.
  
• If the player is cursed (or becomes cursed):
  She switches to close-range attacks, dealing damage directly.
  
• If the player is holding a Cursed Candy in their hand:
  Hollow Girl stops attacking and approaches the player, asking for "Trick Or Treat".
  (Simply having the candy in the inventory is not enough, it must be held)

When Hollow Girl reacts to the candy, this peaceful behavior lasts 5 seconds.
After that, she becomes enraged for 30 seconds:

• She no longer responds to the candy.
  
• She becomes aggressive again and resumes her usual behaviors.

The player can give the Cursed Candy to Hollow Girl during the "Trick Or Treat" state.
Doing so:

• Curses Hollow Girl
  
• Makes her vulnerable to damage
  
• But also allows her to deal damage immediately, without needing to curse players first

There are two ways to hurt her:

• If Hollow Girl is cursed (after being given Cursed Candy or reflecting the projectile):
  → Any player can damage her.
  
• If Hollow Girl is not cursed:
  → Only players who are cursed can damage her.