Hi Fififrog, we had an amazing day yesterday, I can hardly believe it. I actually got her down for three long naps and at night without rocking. I keep thinking I will wake up and it will all be a dream. It will probably all go out of the window by tomorrow but for now, this is what we did, in case it helps at all.
For the last 2 weeks I have been trying to slow down the rocking (only really rocking if she gets agitated) and eventually not rocking at all but just letting her fall asleep in my arms. This was absolutely knackering and sometimes took over an hour. When asleep I would put her in the cot, although she often would wake up on the transfer and then I would have to pick her up again (whereupon she would fall asleep again until I put her down - a bit demoralising!).
As suggested, I have also been trying to introduce sleep cues in case that worked - basically dummy in, sing Twinkle twinkle a few times and stroke head and then swaddle before starting rocking/standing still. I would ssh whilst rocking/standing still. The swaddle was a bit hopeless as she would fight to get out, but without it she was flailing and waking herself up all the time by scratching her head and rubbing her eyes etc.
I had started to get the odd nap out of her which was longer than 45 minutes (sometimes over 2 hours, which was amazing) but the majority was 45 minutes (which after 45 minutes + of standing still with a 15lb baby in your arms was a bit of a killer). It was starting to take a bit less time to get her to sleep in my arms so slight progress.
I gave up on using a swaddle blanket and bought one of those baby strait jackets (an Ergo Cocoon - recommended by one of the mums on Pukeyrag's clingy baby thread - thanks Pukey!).
Anyway, yesterday, as I put her on our bed to sing lullaby and put dummy in her eyes started drooping (usually she has eyes propped open for ages) so I quickly zipped her in the Cocoon and put her in the cot. I put slight pressure on her arms at her sides (so it felt a bit like being held/cuddled) and started sshing. Unbelievably after 25 minutes of doing this she fell asleep. And stayed asleep for 1.5hrs!!
Tried the same thing for the rest of the day and this morning and it has worked (and only took 10 minutes this morning)! She woke up from the second nap after 45 minutes, but I went up, put the dummy in, cuddled and sshed for 10 mins and she went back to sleep again for another 45 mins.
There is sometimes a little bit of crying and wriggling at the beginning but just by increasing the pressure on her arms to try to hold her still (but gently) helps this. It worked in the night as well, except when she was hungry when it didn't work of course and we had to get her up and feed, but she settled again afterwards quickly (25 minutes rather than the usually 90 minutes).
Felt absolutely at the end of my tether last week, so am really hoping this continues. I am not sure what of all of the above has been the most help or whether it is all of it. I think the Cocoon is really helpful as it makes her feel cuddled even when we are not there. Also, getting her to sleep around 1.5hrs of being awake. Stopping the motion must have helped too, although exhausting. Or maybe the penny has just dropped for her now. Who knows?!
Sorry for writing a novel. Thanks for all the tips above everyone which have been fantastically useful - will let you know if this progress continues and whether we have truly emerged from (as my friend calls it) "rocking hell".
Good luck Fififrog - I thought we were a truly hopeless case, so I hope this gives you a bit of hope.