Please by all means reward her for her cooperation with the brace by giving her this one important night off! One night off in the scheme of things is nothing. I am quite sure her orthopedist would say that was fine if you asked, also. I think this type of small concession/reward goes a long way to pave the way for continued acceptance of the brace. She will have lots of fun and get to forget about her scoliosis for one night, which is really important.
Gayle, age 48
Oct 2010 fusion T8-sacrum w/ pelvic fixation, TLIF at L4/5.
Feb 2012 major lumbar revision for broken rods @ L2-3-4
Aug 2015 rods broken L5, A/P revision 9/23
mom of Leah, 13 y/o, diagnosed '08 with 26* T JIS (age 6)
4/08 26 degrees, brace 16 hrs/day
9/08 17 deg. OOB - brace discontinued
9/09 30 deg, resuming brace
5/10 VBS Dr Luhmann Shriners St Louis
4/15 stable 5 yrs post-op, 18* T/ 22* L, Risser 2
also mom of Torrey, 10 y/o son, 16* T, stable