You still need a way to downgrade NATIVE_FIRM for 11.0, which means DSiWare downgrade using an already hacked 3DS and system transferring, or a hardmod. This does mean that after doing that, you can use Browserhax to downgrade to 9.2 instead of needing an alternate entrypoint.
@Bunjolio, I don't really think your sister should be doing those things at a young age. No offense, but its likely possible that she got manipulated online?