Hey I'm back earlier than I expected to be
So I have some questions for you so we can get a good idea of what is going on.
Is your LO on EASY (more like EAEASY at this age really)...and if so what time are you trying to put her down for her nap/s during the day?
You say that you feed her to sleep or cuddle for naps, have you tried to bring the feed forwards a little to break this association? Before you started doing PD were you feeding her to sleep over night also?
Look this is just my opinion but as babies get older being super consistent is SO important because they have not only a desire to have their needs met but they also have personality coming into the equation. It does sound to me like you have become a prop in several ways, feeding and cuddling to sleep in the past but you CAN get past this. The important thing firstly is to be really observant about what is going on with your little girl....
Get her wind down before bed really predictable and low key (no television or anthing along those lines), the more predictable the better, even to the point where you always read the same bed time story (you can change this later once her sleep is going better).
Get yourself a "key sleepy phrase" to say to her, you can say this soothingly over and over if it seems to help her calm. Calming verbally is really useful, it's amazing how helpful your voice can be to them.
Then be really clear in your own mind when you are going to intervene, really listen to her cry, is it getting louder and more insistent? Is it stopping and starting or sounding pretty much the same (this is probably her mantra, self settling cry). Really do try and calm her with your voice and pressure from your hands first and if that doesn't work then PD. DON'T give her eye contact, and keep everything really quiet...you don't want her to turn this into a game.
Another thing I was thinking is that a lot of babies find your presence in the room very stimulating, especially spirited babies, so I've included a link for you to read about walk in walk out and gradual withdrawal from the room:
http://babywhispererforums.com/index.php?topic=80750.0Finally I would say if you are going to do PD with your LO you really have to do it for naps too....the more consistent you are the quicker this will work, so brace yourself, enlist some help if you can and lets see if we can get this happening for you all!!
Sorry about all the info, but hope some of it helps
xxLizzie