hello there,
I am so sorry about your daughter condition.
I am new to this site and your message was posted several months ago. However for future reference. I am a leukemia cancer survivor and I had several bone marrow biopsies. The worse one I experience was the same way you were describing your child had. But it does not have to be that way next time( hoping there is no next time) she can ask to be sedated. She will not be completely out. She will be with her eyes open and feel it but nothing like what she went thru. It is almost painless. I used to be so afraid of getting a bone marrow biopsy done, but after my last procedure I am no longer afraid.
Take care,
Julie