Prediction: Garlean Primal

[kikix12]

I think this is a bit of a leap to be honest.
A lack of ability doesn't equate to an active prevention.
It could simply be that Elidibus being in Zenos' body, means he ADDS this magical ability to the 'magic-less' body.

This actually supports her claim. If Elidibus can use magic from a Garlean body, then it DOES mean that it's the soul that stops them from using magic, not the body. That's exactly what ChaseNetwork said.