That's arguable. Like, very arguable, unless we got a QM message I missed. There's plenty enough weirdness in how Lydia was born that I still have odds on Kemmler discovering remnants of Autochtonia somewhere deep in the NeverNever.
Arawn got them, they didn't get away:
MId-combat is not "on her own terms on her own ground". And most things Molly would be summoning meaningfully, would be obvious stuff. Devils, monster, etc. High level, high power, but not subtle. Well, maybe also some ancient magical cybernetically enhanced monks or something.
Lydia gets to summon a lot with low level stuff, and then, if and once those are killed, reanimate them as undead zombies. And the "call ghosts from across the country to you" is a celestial-grade BS.