Turning your back so she can’t see you could be interpreted as a response from your side (and she wouldn’t be wrong...), and she might then think she hasn't been clear enough, so she’ll double down.
The best thing is to either take decisive action or do NOTHING at all. Avoid any hesitating or actions that might betray your emotions, etc.
''We don’t force her to come into the bedroom with us, the door is open, but usually she follows."
Careful there—you’ve let her make the choice.
It’s much better if this kind of decision comes from you rather than the dog.
Personally, I think it seems a bit extreme to go from having the door open tonight—allowing her to come and go and move freely around you—to... a closed door. You’ve got her used to something else, you’ve given in a few times, and then suddenly the door is shut?
It might work, but it seems risky to me.
You know she might bark if you don’t respond to her demands, so I think you need to avoid putting her in a situation where she can fail (scratching at the door, for instance, or heaven forbid, chewing on cables...). You want to avoid a sudden change that could trigger strong negative emotions. Finally, you want to avoid the risk of having to change your mind because she’s barking, getting out of bed, and then what? Considering everything you’ve already tried and given up on... it wouldn’t make any sense to her and wouldn't get you any further.
If I were you, I’d try getting her used to it during the day first, over a day or two. A few times a day, close the blinds if you need to, go into the bedroom, and stay there for just a few minutes, gradually increasing the time. Start with her in there (optional), then without her, with the door open but using a baby gate or something similar. That way she can see and hear you but can’t come in. Only come out when she’s calm; you don’t want her thinking that by making a fuss, she can get you out of bed. You can give her a bit of praise for being quiet when you leave the room, but don't overdo it.
In the meantime, for the next two nights for example, why not sleep in the lounge with her, since that’s where she’s least restless? Then, after a couple of nights, you can decide on the best course of action: either keep going like that but gradually shortening the time you spend in the lounge over several days, or opt for nights in your bedroom with the door open and a baby gate... (but until then, it’s best to prep her for it just in case, rather than doing it out of the blue).
Alongside that, it would be good to teach her to "stay" on command in a specific spot. That could really help you turn a corner when you want to start closing the bedroom door, for example.