Playstyle
Awakened Hailey is a Magical Damage DPS guardian. Her immortal form continues the style of her Mythic form in having a large ATK boost. To compare the ATK boost she gets from her skills, you'd need this much gold to get the same bonus from Money Gun:
- 285k gold at Money Gun 1
- 259k gold at Money Gun 2
- 238k gold at Money Gun 3
- 219k gold at Money Gun 4
- 204k gold at Money Gun 5
- 190k gold at Money Gun 6
- 178k gold at Money Gun 7
- 168k gold at Money Gun 8
- 158k gold at Money Gun 9
- 150k gold at Money Gun 10
- 140k gold at Money Gun 11
This makes her especially good for lower sb/mg players and also particularly good for shorter game modes (PvP, guild raid, underground cave) where Safe Box doesn't have time to grow gold to a significant level. Even at higher Safe Box levels, she is a really strong Wave Clear and is always worth a summon.
Skills 
Power of the Sun - Passive
Power of the Sun increases ATK by 2000%. Additionally, skill damage increases by 5% for each different Mythic unit on the field.
Solar Ray - Skill
Has a 10% chance to deal 18000% Magic DMG to enemies in range.
Big Bang - Skill
Has a 10% (+5% at level 12) chance to inject energy into a target. After 10s, the energy explodes, dealing 10000% Magic DMG to enemies in range. If injected to the same target 3 times, it explodes immediately, and the explosion deals an additional 100%.
Flare - Ult
Creates a blazing sun for 10s, dealing 4500% Magic DMG every 0.4s and 50% (+50% at level 6) to nearby enemies.
How to Summon
Awakened Hailey is summoned based on a 15% chance every time Mythic Hailey uses her Ult while having full Star Power (10). Because of this, you can significantly speed up how quickly she can be Awakened by improving MP Regen.