I have some time now. So, in your shoes I would do the following:
Nice new bedding, pjs, cuddle toy or something, make it special, she’s now a “big girl” and will be in her own room, yay! Move the bed early one morning, do day time naps in it as usual. Spend lots of time in the room, maybe even do that the 2-3 days prior to moving the cot.
First night: bath, pjs, feed with low lighting in the room. Say goodnight, you’re a big girl now, you can sleep here and I’m just next door, and I love you. Leave, leave light on outside her room so it’s not too dark. Go back in after 1min, shush and soothe vocally, maybe pat. Don’t stay more than 15-20secs. If she’s sat up or standing lay her down once with a “it’s sleep time now, we love you, night night”. Leave. Repeat after 2 mins if necessary (it probably will be), then 5, then every 8 or 10mins depending on what you can handle. Set a stopwatch. Don’t give in. Reassure verbally, gentle stroking, brief pop ins or you’ll just make it worse. Ideally alternate with your husband so it’s not all on you.
Choose say 2 times in the night that you think she needs a feed. Go in and dream feed ie half wake her, to eat. She must be asleep before you feed her, if she’s already crying then you’re going to confuse her- sometimes she cries and gets fed, other times not. She won’t know what’s what.
All other wakings, repeat the pattern above.
Commit to one week. Get your partner on board so no one gives in. It’s gonna be tough, you will be tired. At the end of the week reassess, and likely you’ll need to mentally commit to another week. Within 2 weeks, it should be cracked. You can then shorten and gradually drop the night feeds; your milk supply will adapt if you do this gradually.
You MUST BE CONSISTENT. It won’t work if you freak out on the first night and give in, or give in at 4am. It will make things worse as your child will be confused. Children are like animals, they need clear boundaries, and you’re wiping the slate clean and making it clear that baby is safe and loved and not forgotten - but at nighttime we sleep.