I’m glad you posted this!
Here’s my advice:
Save your resources for someone much more worthwhile.
I understand your way of thinking, because I too thought her gold skill was cool, and I made her my very first Gold hero. Come to find out, however, its completely useless.
Please refer to this link for a previous thread about this topic: Pheonix Gold Passive Ability
I hope the devs consider giving her a buff 