Theory about Mark’s Wife

I just finished the series for the first time. I tried to look through as many theories as possible to avoid repeats theories, but there may be something similar or the exact same out there but here goes:

I think when Gemma died, she merely went brain dead. I think that the Severance chips do actually house memories and can serve as a sort of CPU for the brain. So Lumon took Gemma and gave her the Severance Procedure. Whenever they switch her on, she’s alive and walking and everything. When they switch her chip off, she goes back to being brain dead and experiences nothing. A permanent coma. This could provide some drama for Mark in the next season where he wants to unsever his wife so they can remember things together, but if he does he’ll lose her all over again.

Like I said, I’m sure there are similar theories out there, but this is the biggest one I thought was most plausible.