I would in no way allow an 11 year into my bed. We have a queen sized bed and no way could they fit.
I also think your daughter is winding and twisting herself into this emotional state. A bit if a drama queen.. When they were younger we would call this a tantrum.
Sure this was brought on by reading something, but she herself did this without permission.
This has gone on way too long, she needs to get back into the habit of going to bed on her own.
I agree, exercise is part of what she needs. She needs to get rid of all of this pent up energy. Maybe extra housework if she cannot go outside. Magic erasers starting on the walls in the hallway.. The cabinets in all of the bathrooms? Every room until she is worn out.
To relax, her evenings will need to be calm. Not a lot of loud talking, rushing around. Maybe cut the TV, that keeps the mind going having all of that extra sound in the background.
No extra electronics. Make her some
"Celestial Seasons, Sleepy Time tea" (no sugar or honey) before her bath time. Encourage her to take a VERY warm bath or shower at night.
Make sure there are no outside noises in her bedroom.
She needs to make sure she already has everything ready for the next day, so she is not concerned about homework, school, supplies etc.
You may want to teach her some calming thoughts. Sit next to her bed with the lights off and guide her.
While she is in bed tell her, (speak softly).. "Imagine your feet are falling asleep", give her moment. "Now imagine your shins are falling asleep.".. your knees, your hips, your stomach, your shoulders, your hands, elbows.. You get the idea..
Do this a few nights, until she will have this in her mind and can do this on her own.
If she throws a fit, screaming (tantrum) tell her you will not go in until she is quiet for 10 minutes. If she starts up again, tell her you are starting the 10 minutes over again.. and mom, do this. Do not break down.. She needs to know you are stronger than her and you will not put up with this foolishness any longer..
She is a preteen and certainly is showing it.. You are stronger than an 11 year old. You can do this.