Hmm...
does she like stuffed animals?
If she does, get her a huge cozy beautiful Teddy-Bear,
make the toy magically alive together (nobody believes it this age, yet my children still (age 25,23,17) continue playing this our "all the toys are alive" game...
if she will like her teddy-bear, maybe she will be hugging IT and talking to It and it will calm her down and make her feel comfortable, safe and protected...
why did i think about such a peculiar solution (hopefully, solution), is this:
when I was growing, in our family we did not have toys, as my parents thought it is just a waste of money and toys are not a necessity. So, I got my VERY first little teddy-bear when i was in the 8th grade = count 13 years old. I was extremely happy, sewing him jeans, and every evening going to bed I hugged the little fellow, talking to him, telling to him all my secrets, thoughts and feelings, as I did no have an option to do it with my parents... they were rather different, and did not inspire soul-to-soul conversations.
I do not mean for you to replace all your loving attention with the teddy-bear: if you continue coming into her room in the evening, and having a nice little loving talk, this will help for years to come for you both to be close friends... but AFTER you spend some cozy loving time together, you wouldn't need to stay there for an hour and a half waiting when she will really fall asleep, but kind of pass the task of hugging and making the space cozy over the the teddy-bear... so that she feels not alone when you leave the room.
I hope all will be well soon, M.!
Thinking of you both,
M.