I'm trying to get my son to settle in his cot rather than fall asleep on me at the moment and am working through a few of the suggestions in No-Cry Sleep Solution. Some of them might help, I don't know if this is your kind of thing:
My son doesn't have a dummy, but she suggests could you put 6 dummies or so around her cot? (if you don't mind going back to the dummy)
Also, does she spend nice time in her cot in the day? this can help to break the association of it just being the place mummy leaves her alone at night. just to play for 15 mins or so a couple of times a day.
can you play some favourite music in the background, just at the time she goes in the cot? or some soothing music for babies bedtimes?
has she got a favourite doll / teddy etc. who can be waiting for her in her cot (think you can even get gro-bags for teddies!)
the book also suggests phasing the way she falls asleep, like gradual retreat.
So phase 1, let her almost fall asleep on you, by rocking, cuddling, etc. whatever works, then put her in the cot, still holding round her until she is asleep. when you think this is working, move onto phase 2, do the same, but put her in the cot when sleepy, not almost asleep. if she cries pick her up and repeat, however many times needed until she falls asleep in cot. when this stage is working you can then move onto comforting without pickups, then without words, then without going into the room. It's not quick, it might take a few weeks, but I've just started with my son, who is 5.5 months and has always fallen asleep on me at bedtime and if he woke when I put him in cot, would have to hold until he was asleep again. I'm only on my 3rd night of it and he's already going into his cot awake and falling asleep in there with me comfoting him.
I know I wouldn't be able to do controlled crying, so that's why I like this book. It's not a quick solution, but what I like about it is she accepts that some nights you'll just go back to doing what you know works, because you're too tired, so it totally allows for set-backs etc.
Sorry if you've already tried all of these suggestions!