I was a bit unsure if the fantasy/conditioning Erin is experiencing was happening to her soul inside Miriam or to her mind inside her zombified body.
I still think the latter.
Aiken seems to be experiencing his own fantasy/conditioning (involving an entirely fictional version of Erin), but I guess that must also be happening to his soul (since we can see the very end of Miriam consuming it in the first panel of 1344).
Aiken apparently had a sexual relationship with this younger Erin, e.g. in 256. I'm figuring (I mean, who knows, right?) that in the absence of a soul, memories and ideas or fantasies floating around in the mind are able to take hold. It's possibly interesting to note that we first saw that Amaltheia was suddenly fantasizing about Miriam (863) just as Zenon was grabbing Erin's attention in The Cloud. Whether Erin's doctor scene somehow ties back to her brief spell under Zenon's control I can't say, but maybe it's possible.
The victims have all been taken under Miriam's control, so ideas that she implanted are also present in their minds. Jacqui's role in her scene strongly echoes things Miriam said to her this evening. So maybe it's more the case that memories and ideas or fantasies floating around in these minds are being used to produce dreamlike illustrations of Miriam's instructions.
What I see here is Erin being programmed to serve one person while secretly being under the deeper control of another. I can understand how that would translate to the real world in a way Miriam would want.
Precisely.
See, what holds me up on thinking it is the latter is how Miriam herself describes the process to Reka back when the soul sucking was about to begin in issue 1309:
“I’m sliding into your mind. Then I’m going to envelop it, and dissolve it and consume it. And then once you’re empty, I’ll pour my own will into you.”
That to me seems to suggest that Miriam’s programming is happening directly to the souls rather than to the minds in soulless bodies. Miriam specifically says that she is removing and consuming a part of the girls, leaving them empty, then plans to pour her own will back into them. Seems to fit more with a “soul washing” happening within Miriam which will culminate in her returning the altered souls to their respective bodies than simply holding the souls in stasis while the real work is done in the docile bodies via suggestion or some other influence.