S.W.
Maybe I'm hard-hearted, but I really believe that kids need to learn to fall asleep on their own... no tv, etc... and stay in their rooms all night. I think it's important for my husband and I to have privacy and I think we all sleep better in our own beds. We started this from an early age and my kids do great. I really think you just need to be firm and consistent. Don't stay with her until she is asleep or she won't be able to get back to sleep without you at night. When she calls for you give her a quick reassurance that you are there and that's all. I know hearing "I'm scared" really breaks your heart (and 3 or 4 I think is when those imaginations really kick in), but I realized that my son quickly figured out that this would get him a lot of sympathy and attention. So... quick reassurance and then out! Good luck!