I don't think they should attempt trying to let someone sing her songs, lip syncing would work perfectly, as long as it looked real. And it would be interesting to see that, as I don't think we'll ever know exactly what happened that night. I'm not sure what you mean by wrapping up all of the things I said in a film in one year, can you elaborate a bit?
expose more people to her music while displaying her in a respectable, but truthful and relatable manner
...what I mean is if you're gonna make a film about her life and music, you should get to know her well, and, unless you were a fan before or took the time and dedication to explore someone who people still have trouble figuring out after years of close following - you might have trouble doing a decent, respectable but compelling piece of work in a year. A lot of right people need to get together, you know? As for the singing, it certainly helps. Since seeing Joaquin Phoenix and Sam Riley doing such amazing jobs with was thrown at them, I'd think lip syncing was lazy and dull.