That's backwards,
The higher your Celaena Affection Score the more perks you have. And the stronger she will become.
Here is the full list of Celaena's Spells and the PC perks. The perks are tiered at 1,3,6,10,15,21,28,and 35.
As you can problably guess something will happen to Celaena at the end of this story arc which is when all of this will become active.
Code:
Appendix A: Celaena Affection Scoring ‘CAS’
Celaena Abilities
Average CAS/2
1. Charm person, Detect Evil
2. Alter Self, Detect Thoughts
3. Suggestion, Tongues, Vampiric Touch
4. Charm Monster
5. Damnation Stride
6. Mass Suggestion
7. Ethereal Jaunt
8. Frightful Aspect, Sympathy
9. Power Word Kill
10. Become Mythic
PC Abilities
CAS: 1,3,6,10,15,21,28,35
I. Profane Gifts
II. Telepathy with Celaena
III. Access to Celaena’s Spell List -3 affection rating. e.g. CAS rating 10 you get access to them as if you we're celaena herself with a CAS of 7
IV. Gifts and Spells become Divine.
V. Spell Resistance 25 + CAS
VI. Damage Reduction CAS/evil
VII. Become Mythic
VIII. Divine Intervention “Celaena is God Tier at this point”
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Rule Clarification: What is Mythic?
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Every one wants to go toe to toe with Mythical Evils/Goods (e.g. A demon lord) and win. As you are now, they will obliterate you. Currently the only option is to max out CAS (40 is the max)
This drastically increases your survival chance if such an encounter where to happen. Their will always be a way to survive normally. But it will not kill them. In order to do that, you must defeat them using you mythic powers, more on that later.
If you've played Pathfinder you have a good idea of how mythic stuff works, I will go in detail on this later. It has a much more broader spectrum in this multiverse.
tl;dr Your primary goal should be to become mythic and annihilate your foes like no one ever has before.