While referred to as 'summoning' it is more accurately manipulating and shaping a mixture of one's own aether and the latent aether within the gemstone you use as a catalyst.

[ she gestures to Emmy, who proudly flicks its tails and increases the amount of aethersparkles drifting down from its aura. ]

A construct made of your magic, essentially.

[ her summon is done with minimal external aether, leaving her more closely connected with it. it's a bit more of an extension of herself than it is for any other arcanist she's encountered.

... so it makes sense that a creature crafted from her magic would enjoy Loki's presence. ]