I'm calling shenanigans.
The fae Star Chamber dark secret society 44 levels above Ash security clearance poisons young troubled Fae and then gives them a cure if it seems like they're going to turn their life around and stop being such a fuck up.
Just like the Trill Symbiosis Commission.
Just like that test where they drug the slayer till she has the strength of a small girl and lock her in a house with a vampire.
If most fae are nearly immortal, it only makes sense that they would need a means of controlling their birth rate, or life expectancy as to not endanger decimating thier live stock... However 6 billion humans is a steep jump and you would think that the fae would consider either a culling or increase their numbers to proportionally match the human population.
Bo is a dick politically, which is why they are fixing her dawning.