I agree with Richdog. I never had any problem with My daughter's sleeping until few months ago, she would wake up 2-3 times a night calling/crying to us to go to her, I had it so easy with her so didn't want to give in and same as you tried few things but in the end she just wanted more light rather than her small bedside light. Got her a bigger one and problem solved-))
worth trying.
would she say what bothers her?