Welcome to BW! Have you read any of Tracy's books? If so, are you currently using EASY with your dd? BW does not support leaving a lo to cry it out, we believe that is damaging to the trust relationship between parents and children, and that there are better ways to help our lo's learn how to sleep independently. So I would encourage you not to leave her to cry for any length of time.
If you can post your routine for the day, that will help us see better what might be going on. Also, do you have any kind of a wind down routine that you use when it's time for naps and bedtime? When you put her down, is she awake? Does she just lay there and not go to sleep, or is she crying?
There are loads of moms here who've had all kinds of napping issues, we are all here to help!
hang in there!!
hth
michelle