In addition to Selene's abilities upgrade,
I had the impression that my fairy was better than before.


I found this hidden in the patch notes and might explain it:

Pets have been adjusted as follows.
The base accuracy of pets has been raised. Furthermore, all pet attacks will now be treated as if attacking from the rear.
Pets will now receive the attribute bonuses of food items.
In order to receive the effects of the caster's spell speed attribute, all pet actions excluding auto-attacks have been changed to elemental damage.