haha we had to opposite problem - DS would move around so much he would bang his head on the end of the cot and we would have to turn him around every 2 hours when he woke up doing it!!!!

I would just think that she is very contented, and perhaps a deep sleeper so she doesn't have to move?

DD doesn't move as much as her brother (he was moving up the cot at around her age) so hopefully she doesn't move ever.. lol