S.R.
My daughter has changed her bedtime habits relatively recently as well. (She's almost 2.5) She never used to be able to use a night-light. She was always very light-sensitive. Then, out of the blue, she was terrified & we started using one. Solved the problem for a little bit. Now, we're using two night-lights.
Also, as time consuming as it may be, have you tried staying in the room with her until she falls asleep?
Hope this helps!