Yet even in your IC talk you just called them enemies, despite only two of them having attacked you so far.
Of course. They are still opposing her.
And Mao didn't even bother to talk/sense motive, so she clearly never considered the chance that they're charmed/dominated. Deploy drones. Maximum beatdown. Surrender is not an option.
Naturally! They saw her, then attacked her without saying anything while the others were attacking civilians.
That sealed the deal. If they are androids and don't recognize her, something wrong may be going on. But they are attacking civilians, so she must stop them as soon as possible to protect them. She knows she cannot kill them so she can just knock them down to protect the civilians and sort it out with them after in better, and safer, conditions.
Engaging in conversation is pointless and not an inefficient way of figuring out what is going on since while she talks they'd still be killing more civilians, along with whatever is going on further back there. She may be nice but she's still a machine. She's here to bring order to the place. She can have tea with them when they are no longer a danger to others and themselves.
If, for example, Amaterasu was dominated and started attacking her and killing civilians with her nukes, Mao wouldn't risk tactics that can fail to stop her killing people more people, she wouldn't hesitate to beat her lights out to unconsciousness to stop the rampage then find a way to stop the domination.
And who knows, maybe they wanted to die. What if the unknown warriors have loved ones that will be executed in gruesome painful ways if they let themselves be captured by the Android Administration?
That's right! They may really need help! Their loved ones could be in danger but the civilians they are currently attacking are in an immediately less theoretical danger of death than these possible loved ones, so they'll take priority for now. Basic peacekeeping procedures. She'll see about those possibly endangered loved ones once they are informed on the matter, and if the damage has already been done, it'll at least perhaps help them to nail whose responsible to put a stop to more androids being forced to kill against their wishes. They ended a war for this already.
Plus, while declaring somebody an enemy only demands one side to do it, declaring somebody an ally is a two-way affair. Unless you want to claim enemies can declare themselves allies to benefit from the party's ally-only area effects and stuff.
They can certainly declare themselves allies to provide effects with benefits. If they want to receive them they have to be acknowledged as allies by the one providing the beneficial effect since the effect that relies on the perception of the one doing the effect, not the one receiving it. If the ability requires the target to be willing, that's a different story.
In our case, they are welcome to benefit from her support buffs while being dead and no longer opposing her.
It's very similar to how it went down with Arryk. She'd love to gets things in good terms with the girl but she had to be handled and neutralized for her own good and to protect the rest of the ship's inhabitants. She would have tried to revive her as well if she had been able to get there in time.