Hi, we have a spirited/textbook little girl and struggled hard in the start to get her to sleep. The only way to calm her was the reverse breastfeed position on her front (Happiest Baby on the Block DVD - Dr Harvey Karp) and it worked miracles.
Beth has slept on her front since she was 6 weeks old and we have never had any problems, Beth has always taken 2hr naps and slept through the night and I am sure it is because of EASY, swaddling and sleeping on her front. If she ever rolled on to her back she would only sleep 45mins.
Having said that, you must be comfortable to have your little one on her front. Maybe you could start having her propped up on her side??
Good Luck
Rosie