Time for a lesson in independence.
Are the blankets where she can reach them? or are they on her bed but she's just beeing needy? How long as this been going on?
Based on the info that you gave, I would suggest:
- Keeping the blankies where she can get them.
- When she hollers for it, come in the room and turn the light on. yes it will wake everyone up, but there's a point.
- Direct her, curtly, to get out of bed and get her blanket.
"get out of bed. you know where the blankets are, go over there and get one. Good. Take it over to your bed, spread it out.
let her start and try for a bit then help as needed. then when she's back in bed and comfy, here's the lesson.
"See what you did? You wanted your blanket and there it is, you did it yourself. You know where your blankets are and you can get them yourself. You don't need me for that because it wakes everyone up. Ok? Mwa. Ganight.
The whole reason for being curt is it's a simple way to express your displeasure without much longevity. a couple nights of that should make the point.
 you may wind up with a bunch of blankets to fold up every day, but that's a small price for you to pay for her sense of independence and the well-being of the others.