Eventually, Eveline makes Mia watch a video tape to restore her memory, in which it is revealed that Mia was a covert operative working for an unnamed corporation that developed Eveline as a bioweapon.
Eveline makes Mia watch a video tape to restore her memory. This is eventually. Mia was a covert operative. This was what it is revealed. This covert operative was working for an unnamed corporation. This unnamed corporation developed Eveline as a bioweapon in her memory.