E.P.
I also loved Healthy Sleep Habits, Happy Child. Some reviews focus on the fact that, yes, he says the quickest way to extinguish a behavior is by 'cry it out' - basically that if you don't reinforce a behavior at all, they will stop doing it. It did work for our son. He was waking up about 1am and I kept going in, putting his pacifier in, turning on his mobile and it was crazy. He didn't really need anything, it was just a habit. I let him cry one night (which was the longest hour of my life) and he didn't do it again - now sleeps through from 6:30 until 5-6am. And I thought cry it out was the most horrible thing ever until I had to deal with random night waking...
Psychologically speaking, sometimes reinforcing will prolong a behavior, which is why slot machines, for example, are so addictive. So if you sometimes let them cry and sometimes go in straightaway then this is going to draw it all out. He also suggests 'check and console' so you soothe with the minimum interaction. I do that in the day.
But really HSC,HC's main points are a) that good sleep begets good sleep and that means throughout the day and b) that by recognizing your child's tired signs and putting them to bed then, you can avoid them crying altogether. So that might be a good starting place - when she is just starting to look tired, try putting her down in her crib. Maybe put something in that smells like you, too. If she has a lovey that is also really helpful. Our son has a toy that is his sleep toy and he cuddles and chews on it in bed. It helps when he needs to sleep somewhere else.
Hope that helps a bit! It was longer than I meant!
E.