T.S.
Hi K.!!
Is there any chance that your daughter is teething? Maybe getting some molars? I have a 14 month old working on her top front teeth (she is a late/slow teether) and she has always had a horrible time with teething pain. It's been keeping her up more than usual for the past few nights.
However, on nights when teething is not an issue, we have been using Dr. Jay Gordon's sleep solution with great success. It is a gentle, no-cry solution for helping toddlers sleep through the night, or at least wake up significantly less overnight. It is designed to work over a period of 9 consecutive nights (divided into 3 sections), but may take longer depending on the child. Here's a link to the article: http://www.drjaygordon.com/development/ap/sleep.asp
I hope you find this as helpful as I have!!
Good luck,
- T.