L.S.
I'm not sure if this will help, but I do think that your routine is fine. Just tuck her in and close the door. Eventually, she'll get the hint. If she cries, she'll be fine. You'll know that she's fed, clean and loved also. It may take up to 2 weeks of you sticking to this and she'll get the hint. Maybe she has bad dreams. You can read to her about bad dreams. I've read the Blue's Clues Bad Dream book to my 4 yr old and so far, no bad dreams. All I can recommend is to let her stay in her room and she'll get bored. The toys should be cleaned up and if needed, put away. If this doesn't work, then you may want to get her checked out. The older she gets, the harder it'll be. I hope that it works out for you.