Well, I asked for opinions and by-golly I got them!!
Just to clarify a couple things - as I mentioned in my original post, sleep has been a bit of an issue for my DD since she was a baby - I may have put this down to my parenting initially, as she is my first born. However, 2 more DC later, whose sleep is what I'd perhaps term 'normal' and I now know that different kids sleep differently, even when treated in exactly the same way. Case-in-point - DD2 goes through exactly the same bedtime routine as DD1 and falls asleep quietly and happily (even with DD1 ranting in the bed next to hers). So I am fully aware that not every child responds to things in the same way. Hence I was asking for advice on dealing with MY DD, and her own particular set of circumstances, perhaps from people with similar DCs/dealing with similar issues.
I did indeed call my daughter a drama queen and attention seeking, but I did follow with the sentence ?And I love her dearly?! She is lively and dramatic and entertaining and a bit of a whirlwind, which makes her great fun to be with in the daytime, but not so much at night. She is not a horrible spoilt child. She is generally very well behaved and doing great at school. I?m a fairly middle of the road parent, not mega-strict, but not a pushover either. We have rules and standards that are not up for debate (certainly not ?drippy? !!). We have never used a naughty step or similar as naughty behaviour has really never been a big issue ? she responds well when chatted to about why a thing is naughty and why she shouldn?t do it again. This sleep thing is really her only problem.
Also, my OP may have given the wrong impression ? I did not leave her alone in the dark wailing for 3 and a half solid hours! We had a 3 and a half hour session involving her crying and trying to persuade us to lie with her, her getting up for the loo, her coming to our room and us taking her back, us checking on her if she did happen to be in her bed for any length of time etc etc. Her sister is in the room with her, and we are just along the corridor and she has a night light. We were not shouting at her. Also ? we did not suddenly go from lying with her one night to utterly abandoning her the next! As I mentioned we?d gradually moved away from lying with her, to sitting next to her, to leaving her and checking regularly over a couple years. But things have just regressed recently.
Another thing to mention is that I?ve always been perfectly happy to devote a chunk of every evening to the bedtime routine, and whatever settling my 3 DCs required. They aren?t little robots, and I wouldn?t swap the precious hours I?ve spent with little bodies cosying up next to me in my bed. (Actually I have a brother and sister in law who envy us this, as after very successful sleep-training, their DCs now refuse to ever be snuggled over to sleep!!) I?ll never be a cry-it-out advocate, and feel no desire to ?show her who?s boss? or ?break her will? ? really I want to help her without doing these things. And get bedtime back to a happy peaceful time, that doesn?t drag on unreasonably, and encourage her to settle herself in the middle of the night without coming looking for help.
ANYWAY ? last night was OK. Quite late by the time she finally went over, but less crying, and more of her trying to think of good arguments in favour of us just lying with her! And one time when I checked her she said ?by the way, you?re late? cos she thought I?d taken too long, and I laughed and then she laughed too, which helped lighten the mood!! And only woke once briefly in the night.
Finally, I am grateful for all the replies, whether at one extreme or the other. All given me food for thought, and a few good ideas from those posters closer to the middle ground like myself. ExitPursuedByABear ? I actually love your idea to allow some snuggle time in the morning ? then if she appears in the middle of the night I could send her back to bed with the reassurance that it won?t be long till morning snuggle time. (We have been known to occasionally wake to find all 5 members of our family in one bed anyway!!)
Nothing like a good healthy discussion! And really lovely when people seem to genuinely care about other mumsnetters! Thanks folks!