hi L..
I have a friend going through this too. it's a toughy.
is she on a good schedule as far as feeding? the book Babywise, helps so much with that. she should be on a sleep, eat, wake cycle. don't put her down for a nap after she eats. for example: if she eats every 3 hours. feed her (30 min.), let her stay up and play (30min. to 1hr), then put her down for a nap. if she wakes up after only 30 minutes, let her cry for 10 minutes or so, go back and calm her. then put her down again. If you are consistent with this and let her cry for a little while just to learn that this is nap time and YOU choose when it's time for her to wake up, it will only take 3 days to get her used to a new schedule. It's worked for me and many of my friends. i hope this helps for you too! Good luck!