hi
i started wearing a boston brace 12 hours a day when i was around 8 or 9, the summer before 5th grade. i also wore a brace (don't recall the type) after my scoliosis surgery for 6 months all the time with exception of getting a shower. i've never heard about boston braces not helping larger curves, but braces generally don't work as well on larger curves.
as for advice, just try to buy some looser clothes for your daughter, especially pants because they have to fit over the brace. just try to make sure she wears it as much as possible because that way it will be more effective and hopefully correct your daughter's curvature. good luck!
Marlana
16, Senior
Spina Bifida
Boston Brace for 2 years
Spinal Fusion July 25, 2002
Post-Op Brace for 6 months