OP it sounds like you know this isn’t going to work for you or your child, that’s ok. Night waking is hard, my DS was also still waking at night at 18 months and coming into my bed, and I was pregnant (still am) I’m not diminishing that for a second. I think this method can ‘work’ for some kids, in that they either give up trying to get your comfort, which is really sad, or they were ready to go to sleep on their own/sleep through anyway and it was just good timing.
But sleep is developmental and every child is different. DS went from never sleeping through once at 19 months and always sleeping with me, to happily sleeping through the night every night in his own bed by 20 months. I did spend about 3 weeks sleeping on his floor to get him used to staying in his own room, but beyond that I did nothing, he was just ready to sleep through.
It does sound like your DD might need less sleep though, bedtimes and sleep both got better here when I accepted DS doesn’t need to go to bed as early as some other toddlers (or as early as I’d like!) he goes to bed at 8.45-9pm now and it’s no battle, just lie with him for 20 minutes or so till he goes to sleep. He wakes around 7am. He’s not needed 12 hours of night sleep since he was tiny, sounds like your DD might be the same.
Try not to compare your DD to others, she’s only herself. I did find the Gentle Sleep Book helpful for understanding little ones sleep better, might help you? It won’t be this hard forever x