we did a form of sleep "training" (it wasn't really controlled crying cos we didn't have to time it or go back in at intervals or anything). a sleep consultant came to our house to help us with it.
my DS was 8 months at the time but i would assume it would be the same with a child that is a bit older.
when she cries, do the cries sound the same all the time, or does she constantly change pitch and make odd sounding cries? and does she pause every now and then as if she is listening for you to come back?
we had to listen for the above - the different cries were him testing out which one would make us come back in (NOTE: if he was crying in distress or pain we would never just leave him there, we can tell the difference quite easily, and we know that if he wasn't crying just before we put him in bed then he isn't suddenly going to be in pain when he put him to bed).
it took about 10 mins for him to fall asleep the first night and he slept thru every night for 8 weeks after that, then he started teething so we had to get up a few nights, but now majority of the time he sleeps thru from 6.45pm til 6.30am. the longest he cried for was 40 mins, but that was only twice, and we had the sleep consultant on the phone when that happened and she reassured us his cries (she could hear him lol) were not distressed or painful cries, he was just trying everything to get us back in there.
now he will only cry if he is overtired. most times when we put him down he will lie there and play with his blankie for a minute before he just drops off to sleep. even when he learnt to stand up in his cot it didn't cause a problem.