Generally speaking compared to the likes of the DS and such it is fast, has a lot of memory and thus you can afford to code a bit less tightly than you might have felt compelled to do on the DS. Most people would tend not to make an iso of their homebrew as being able to copy plain files to the memory card is far nicer.
@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?