Usual first step, use Identify to see if they have any weaknesses or resistances we should watch out for.
I think Lemiel has the right idea about playing along until they attack. I'd rather we not make the first move, even if they seem likely to attack. I think Lri should step up and try to make it seem like she's interested in purchasing services while everyone else keeps an eye on the other gynoids. Maybe try to offer up something like the gold bangles and ask what those could get you. Gold is valuable in many cultures for many reasons, and that should include this one. After all, machines of this complexity can use gold as a component in some of the most important parts. If we express interest in paying them maybe we can de-escalate this situation?
In the likely scenario where we end up fighting them, here's what we should do: Goma, try to use Puppet again, although I suspect it won't work just as before it's good to test; after that blow the horn for everyone and be ready to apply healing. Cherchiel, Lemiel, and Isalia, put your backs to each other, keep Yulia in the center, and hold back the attackers. But be ready to spread out if they bust out some kind of area of effect attack. Yulia, give everyone an Energize, then a Blizzard, and then the usual barrage of offensive magic. Lri, strike between the tanks, providing a bit of extra muscle to each of them to help them hold back the crowd.
We obviously can't do anything about it now, but when we have the chance I say we go back to that prison plant and free whoever is inside. Either it's someone who was recently captured, or it's someone being used as bait. Either way, I suspect the occupant would be alive, regardless of how much time has passed. Blizzard and some ice magic should be able to deal with the plant without causing too much harm to the occupant. And if we can free the (hopefully living) occupant, which is admittedly a big if, we can get more info about this floor. But again, fight first, just putting this here before I forget.