Here is a link to some info on the effects of music for healing. I didn't think it could hurt to post the music as well. Godspeed to your niece. She is in my thoughts and prayers. With all the faith and hope in my heart; May she and Matthew be healed.
HERE
BACH
JESU,JOY of MAN'S DESIRING
If she can hear this and would like more or different, please let me know I would be glad to post them here.