Now that the sleep cycle is set, you're going to have to work to change it back to a saner one. Wake her up starting with an hour earlier(take the covers away, open the drapes, turn on the lights). In a week, change it to an hour before that. This will put her at waking up at 8:00.
On the flip, put her to bed earlier in stages as well.
Here's the part where all of you won't be happy. Turn off the TV(unplug it if you have to). Nobody watches TV before she's asleep, and no Computer(unless it's in a room that she doesn't get in, and you have team backup).
Play soothing music only(Mine is always WFMT classical, or a classical playlist on the MP3 player piped through speakers), and have a shifting nightlight(I have an LED nova light in the hallway, and it has star patterns in shifting colours play on the wall, and an LED "planetarium" light in his room that displays a night sky on his ceiling).
DO NOT CLOSE THE DOOR. Make sure all of your rooms in the house have dimmed lights(ditto for naptime), and make sure for the first few days she can see you are nearby, maybe doing a puzzle book. Let her know firmly it's bedtime, but you are nearby, then go back to your puzzle book.
You say she says she's scared. Here's something I did for my son when he went through that. (be prepared to vacuum her room a LOT more every day).
"Scary Monster be Gone" dust
1 tablespoon of glitter (the colour she likes)
1 tablespoon of dried basil (whole, then broken by hand)
1 tablespoon of dried sage(whole, then broken by hand)
1 tablespoon of sea salt.
Mix this well and put into a small lidded container.
Every time she's scared, have her sprinkle some of this "Magic Scary be Gone dust" near her bed, the closet door, and her bedroom door.
Make up some appropriate words to go with this.
For my son, who thought he had a boogeyman, the words were, "This is my room, you have to go! Scary Monster be Gone!" Then he sprinkled it where it scared him the most. If a child believes their words have power, not only will they be able to "banish" the scary monster, they will have more confidence in general to speak up for other "scary" things.
Hang in there Mama!