S.M.
I am so sorry to hear what a challenge this is for you and your granddaughter! I am not a professional. I do not know about the medicine. Maybe camp was a bit of a challenge for her this year and she came home expecting to snuggle up to you to sleep and stablize, then the meds somehow also disrupted her body chemistry. Are you able to hold off the nighttime change for a while longer? Let her know you are available for her always and at another time she will be in her own bed. I have had my own sleep challenges with my daughter but she is almost three. We always slept together until our move a couple of months ago. We have had some challenges since. Having out of town guests and us sleeping together again set us back again for a little while. I lay with her a little bit. When she gets out of bed over and over I say in a firm voice It is time for bed, now. And she goes reluctantly and whining sometimes. I had a family bed vision but being a full-time single-mom I need a break somewhere. So I understand if it is just time for you to make the change. Often by twelve years for girls the craving for adults subsides and independence is full on. If you can not wait that long, do what you need to do! Put your oxygen mask on first! And, know you are making the right decision!!!
Many blessings!!!
P.S. I applaud you for going drugless with your granddaughter. Find a holistic dr. or research on line if you can, so the change is least tramatic, and most beneficial to her system. Even making a few phone calls to the right people may do the trick. Of course I do not know her condition and I am not in a position to diagnose care either way. There are many so many alternatives to supporting to our bodies' wellness than medicine. If you have slept with her this long you know plenty about her. Your intuition may be telling you something.