J.,
This is usually a way to deal with stress and anxiety. Try to keep a very regular routine and make sure she does not get overtired. Try putting her to bed earlier than you have been to see if more sleep helps.
Other things to try:
*lots of physical activity in the day - fresh air and exercise
*teach her to blow bubbles - it takes calm and measured breathing to blow bubbles and breathing is an excellent coping skill
*if communication is an issue, start using some basic sign language so she can communicate desires - there are great books and videos in the library about this. Signing time is a tv program (also available on dvd) that teaches sign language to kids. There are even baby sign classes you can take.
*try to give her a special blanket, toy, or other object to hold instead. Especially if you can find something with long strings or hair to hold to
*play some kind of soft, soothing music at bedtime. It could be lullabyes or instrumental - whatever she seems to respond best to. Use the same music for quiet time and bedtime everyday
That's what comes to me off the top of my head. If I think of others, I will post again.
Good luck!